Firearm Case Wad Retention Mechanism for Accuracy
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Solution Overview
Problem
Existing large-caliber firearm ammunition designs suffer from accuracy issues due to wad impact on the projectile chamber, leading to environmental wad rejection and trajectory modification, which affects shot accuracy.
Innovation Solution
Incorporating a means within the case, such as a perpendicular rod or an elastic ring, to stop and retain the wad above the cartridge chamber, preventing contact with the projectile chamber and ensuring the wad is not ejected into the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wad is allowed to be ejected after firing, then the cartridge chamber can be fully cleared, but the wad randomly strikes the bottom of the projectile chamber and modifies the projectile trajectory, affecting shot accuracy
Solution Approach 1:
A rod or ring is introduced as an intermediary component between the cartridge chamber and projectile chamber. This intermediary stops the wad's random trajectory and channels it along a controlled path, preventing direct impact on the projectile chamber bottom while maintaining chamber clearing functionality
Solution Approach 2:
The harmful function of the wad (randomly striking the projectile chamber) is separated from its useful function (clearing the cartridge chamber). The rod or ring extracts the wad from the harmful trajectory path while allowing it to complete its clearing function in the cartridge chamber
2Productivity
If the wad is ejected into nature after firing, then the cartridge chamber is fully cleared, but environmental pollution occurs
Solution Approach 1:
The wad, which would normally be a harmful pollutant when ejected into nature, is converted into a contained element within the case. The rod or ring mechanism transforms the wad's post-firing trajectory from environmental contamination to controlled retention, turning a harmful outcome into an environmentally benign one
3Measurement precision
If a rod or ring is introduced to stop and retain the wad, then shot accuracy is maintained and environmental pollution is prevented, but the device complexity increases
Solution Approach 1:
The case is segmented into functional zones by the rod or ring component. This segmentation creates distinct areas for wad containment and projectile housing, allowing each component to perform its specific function independently while maintaining overall system simplicity
Solution Approach 2:
The rod or ring serves multiple functions simultaneously: it acts as a wad stopper, a trajectory guide, and a retention mechanism. This multi-functionality reduces the need for additional separate components, thereby minimizing the increase in device complexity while achieving multiple beneficial outcomes
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 solution maintains shot accuracy by preventing wad-prompted trajectory alterations and ensures environmental sustainability by retaining the wad inside the case during firing.
Implementation Method 1
the means is constituted by a ring with the capacity for elastic deformation to be inserted into the case, said ring having at least one branch capable of closing off the chamber receiving the cartridge
Data Source
Figure 1~2
Figure 3~5
AI summary
The round comprises a case (1) of cylindrical overall shape, one end (1a) of which is open while the opposite end is closed and exhibits a coaxial chamber (1b) intended to accommodate a propulsive cartridge (2) containing wadding (3), the projectile (4) being housed in a cup (5) fitted from the open end (1a) of said case (1). According to the invention, the case (1) has at least one means (6) capable, firstly, of holding back the wadding (3) upon percussion of the cartridge (2) so that said wadding (3) does not come into contact with the bottom (5a) of the cup (5) so that it is subjected directly to the pressure of the gases, and secondly to keep the wadding (3) inside the case (1).