Pistol Trigger Mechanism with Adjustable Disc Spring
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Solution Overview
Problem
The existing trigger mechanism in pistols suffers from imprecision and high production costs due to tolerances in the positioning of the control spring and trigger bar, leading to inconsistent triggering and structural weakness.
Innovation Solution
The control spring features a precision-positionable disc at its upper end, and the trigger bar has a vertical catch nose with an oblique rear edge that contacts the disc with minimal friction, allowing for improved precision and adjustability, while a reinforced trigger bar design enhances stiffness and simplifies production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control spring is fastened in the pistol body made of plastics with a bent plane abutment surface, then the triggering mechanism can function, but the position of the pressure point and trigger weight become imprecise and non-adjustable due to great tolerances
Solution Approach 1:
The control spring is divided into a base portion fastened in the pistol body and an upper end region with a disc that can be independently positioned. This segmentation allows the disc to be precisely positioned on the control spring while the base remains fixed in the pistol body, resolving the tolerance issue.
Solution Approach 2:
The disc is made removably fastened and exchangeable, allowing dynamic adjustment of the trigger bar's position and angle. This enables adjustment of trigger pull and pressure point, transforming a static imprecise system into a dynamic adjustable one.
2Ease of manufacture
If the trigger bar has a tongue arranged very far rearwardly on a thin horizontal web with an inclined surface, then the trigger bar can engage the firing bolt lug, but the structure becomes weak and difficult to produce with sufficient precision
Solution Approach 1:
The disc with its circular contour provides a curved surface for engagement with the oblique rear edge of the trigger bar. This curved geometry allows precise positioning and easy machining while distributing stresses more evenly than a thin web structure, improving both strength and manufacturability.
3Ease of operation
If the oblique rear edge of the trigger bar contacts the abutment surface with friction, then the triggering mechanism can function, but the trigger weight and pressure point become imprecise due to friction
Solution Approach 1:
The disc's circular contour allows the oblique rear edge of the trigger bar to contact along a generatrix rather than a flat surface. This reduces the contact area and friction, enabling smoother operation while maintaining precise trigger weight and pressure point.
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
This design achieves smooth running and reproducible precision with reduced production costs, enabling precise positioning of components and adjustable trigger pull and pressure point.
Implementation Method 1
a control spring fastened with its lower end in the pistol body, said control spring having an upper end region deflectable in transverse direction
Implementation Method 2
a firing pin unit with a spring-biased firing bolt
Data Source
AI summary
A pistol includes of a pistol body, a slide and a trigger mechanism which includes: a firing bolt, a horizontal control ramp in the slide, a guide coulisse and a guide finger cooperating with the former, a control spring fastened in the pistol body and deflectable in transverse direction, and a trigger bar hinged to a trigger and cooperating with the control ramp, the guide coulisse and the control spring, the trigger bar having a catch nose retaining the firing bolt lug. To achieve enhanced smooth-running and reproducible precision with a minimum of production costs, the control spring has a disc in its upper end region, the contour of said disc being round in the plane of the trigger bar, and the trigger bar has a substantially vertical catch nose in its rear end region and an oblique rear edge cooperating with said disc.