Segmented Hollow Point Bullet Expansion Mechanism
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Solution Overview
Problem
Hollow point bullets exhibit unpredictable and inconsistent deformation upon impact, leading to fragmentation and altered trajectories, and have reduced penetration depth due to decreased mass from hollow cavities, which complicates achieving an ethical kill in hunting.
Innovation Solution
A bullet design featuring a forward-facing central cavity with concentric socket formations and an elongate insert with ball-shaped segments that expand in a controlled, camming action to create a smooth and predictable mushrooming effect, minimizing friction and ensuring consistent expansion across a range of impact velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If hollow point bullets are designed to expand upon impact, then kinetic energy transfer to target body is improved, but penetration depth deteriorates due to decreased mass and increased aerodynamic drag
Solution Approach 1:
The bullet is divided into a solid monolithic body with a hollow cavity and a separate elongate insert component. The insert contains the expander mechanism with ball-shaped segments that can move independently to control expansion timing, separating the penetration phase (solid structure) from the expansion phase (controlled deformation)
Solution Approach 2:
The elongate insert is pre-positioned within the hollow cavity of the bullet body during manufacturing. The expander mechanism is pre-assembled with ball-shaped segments that will sequentially engage with the cavity wall upon impact, ensuring predictable expansion sequence before the bullet actually strikes the target
2Use of energy by moving object
If hollow point bullets are designed to expand upon impact, then kinetic energy transfer to target body is improved, but deformation consistency deteriorates leading to unpredictable fragmentation and altered trajectories
Solution Approach 1:
The expansion mechanism is segmented into multiple ball-shaped segments arranged sequentially along the elongate insert. Each ball-shaped segment independently engages with the hollow cavity at different positions, ensuring controlled sequential expansion rather than random fragmentation. This segmentation provides multiple contact points that guide consistent deformation
Solution Approach 2:
The design changes the expansion parameters by controlling the sequence and position of ball-shaped segment engagement with the hollow cavity. The elongate insert ensures that expansion occurs at specific locations along the bullet length, making the deformation process predictable and consistent across different impact velocities rather than random and fragmented
3Use of energy by moving object
If hollow point bullets are designed with expansion mechanisms, then kinetic energy transfer is improved, but aerodynamic drag increases during flight
Solution Approach 1:
The bullet transitions from a static solid structure during flight to a dynamic expanding structure upon impact. The elongate insert remains concealed within the hollow cavity during aerodynamic flight, maintaining a streamlined profile. Only upon impact does the insert move forward and trigger expansion, allowing the bullet to optimize for both aerodynamic efficiency during flight and energy transfer upon impact
4Use of energy by moving object
If hollow point bullets are designed with expansion mechanisms, then kinetic energy transfer is improved, but mass decreases necessitated by removal of material to form hollow cavity
Solution Approach 1:
The elongate insert with the expander mechanism is nested within the hollow cavity of the monolithic bullet body. This nesting allows the expansion mechanism to be housed within the existing hollow space without requiring additional material removal. The insert contains ball-shaped segments that utilize the cavity space efficiently, maintaining mass while enabling controlled expansion
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
The bullet achieves predictable and stable expansion, maximizing kinetic energy transfer and penetration depth while maintaining aerodynamic efficiency, ensuring effective wounding and ethical hunting practices.
Implementation Method 1
an expansion portion being defined by at least one ball-shaped segment extending forward from the trailing shaft portion, the expansion portion fitting into the concentric socket formation
Implementation Method 2
The barbed rings would retain the elongate insert in the bullet-shaped body as the concentric socket formation is expanded
Implementation Method 3
Bullets are therefore designed to deform upon impact with a target body, which enlarges the cross sectional area, increases the drag coefficient, slows down the projectile and thus transfers maximum kinetic energy within the target body
Implementation Method 4
the forward-facing surfaces of the barbed rings serve as work surfaces against which viscoelastic fluids from the hydrocolloidal target medium can act to facilitate the mushrooming process
Data Source
AI summary
The invention relates to a bullet which includes a bullet-shaped body having a forward-facing central cavity with at least one concentric socket formation defining an inverted frusto-conical shoulder and an elongated insert having a longitudinal trailing shaft portion receivable in a mouth of the forward-facing central cavity of reduced diameter. The elongated insert includes an expansion portion being defined by at least one ball-shaped segment extending forward from the trailing shaft portion, of which the expansion portion fits into the concentric socket formation.