Shotshell with Mixed Pellet Shapes for Uniform Pattern Density
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Solution Overview
Problem
Existing shotshells often produce shot patterns with uneven density, having higher density at the core and lower density at the periphery, which limits their effectiveness across a greater area.
Innovation Solution
The use of shot pellets of varying shapes, where second shot pellets with a higher drag coefficient, often non-spherical, are combined with first shot pellets to create a more uniform and effective shot spread by altering the drag characteristics and distribution within the shotshell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If uniform spherical shot pellets are used, then the shot pattern has high core density, but the peripheral density is too light to be effective
Solution Approach 1:
The patent applies local quality by using different shot pellet shapes in different regions of the shot pattern. Spherical pellets are used in the core region to maintain high density, while non-spherical pellets with higher drag coefficients are used in peripheral regions to enhance spread and effectiveness. This spatial differentiation of pellet properties resolves the contradiction between core density and peripheral coverage.
Solution Approach 2:
The patent introduces asymmetry by combining symmetric spherical pellets with asymmetric non-spherical pellets (such as oval or irregular shapes). The asymmetric pellets have higher drag coefficients that cause them to deviate from the central ballistics path, naturally distributing shot to peripheral areas. This asymmetric element directly addresses the insufficient peripheral density problem.
2Use of energy by moving object
If larger shot size is used for waterfowl hunting, then energy to target increases, but shot spread decreases
Solution Approach 1:
The patent changes the drag coefficient parameter by introducing non-spherical pellet shapes alongside traditional spherical pellets. The non-spherical pellets have inherently higher drag coefficients that cause them to slow down faster and spread more widely. This parameter change allows larger shot sizes to maintain energy while achieving greater spread through the differential drag characteristics of the mixed pellet population.
3Area of moving object
If smaller shot size is used for upland game, then shot spread increases, but energy to target decreases
Solution Approach 1:
The patent uses a composite approach by combining two types of shot pellets with different properties in a single shell. The spherical pellets provide ballistic efficiency and energy retention, while the non-spherical pellets provide enhanced spread characteristics. This composite pellet system allows smaller shot sizes to achieve adequate spread while maintaining sufficient energy through the complementary properties of the mixed pellet population.
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 approach results in a more consistent and effective pattern density across a larger area, increasing the lethal diameter of the shot pattern while maintaining core lethality, as demonstrated by tests showing reduced core density and increased peripheral density.
Implementation Method 1
The second shot pellets have a higher drag coefficient than the first shot pellets
Data Source
AI summary
In at least one embodiment, a shotshell comprises a casing defining an internal chamber, a plurality of first shot pellets within the internal chamber and a plurality of second shot pellets within the internal chamber. The first shot pellets comprise a first shape and the second shot pellets comprise a second shape that is different from the first shape.