Fireworks Shell Cylindrical Casings Symmetrical Display
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Solution Overview
Problem
The manufacture of multiple effect ball shells is challenging due to the need for securing spherical surfaces and routing timing fuses, requiring more labor and skill compared to canister shells, which are easier to produce and offer a louder noise and symmetrical pyrotechnic displays.
Innovation Solution
A fireworks aerial display shell comprising two cylindrical casings joined end-to-end with a lift charge and effects charges, where a lead fuse ignites the lift charge, and a delay fuse sequentially ignites the effects charges through a plug, replicating the appearance of a double-break ball shell with an outer casing forming partially ball-shaped segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If ball shells are used to achieve symmetrical pyrotechnic display, then the visual symmetry is improved, but the manufacturing complexity and labor requirement increase
Solution Approach 1:
The invention divides the shell into multiple cylindrical segments (first casing, second casing, third casing) that are joined together to form the overall spherical shape. Each cylindrical casing is easier to manufacture individually than a complete sphere, allowing for standardized production processes while achieving the symmetrical spherical appearance when assembled.
Solution Approach 2:
Instead of manufacturing a complete spherical shell and then accessing internal components through complex spherical surfaces, the invention inverts the approach by using cylindrical casings with open ends that allow easy access for loading effects charges and routing timing fuses during assembly, then joining them to create the spherical outer appearance.
2Shape
If ball shells are used to achieve symmetrical pyrotechnic display, then the visual symmetry is improved, but the production time and labor skill requirement increase
Solution Approach 1:
The shell is segmented into multiple cylindrical casings that can be manufactured independently using standardized processes. This segmentation allows parallel production of multiple components and simplifies the assembly process, thereby increasing overall production efficiency while maintaining the symmetrical spherical appearance.
Solution Approach 2:
The invention changes the geometric parameter of the casings from spherical to cylindrical, which fundamentally simplifies the manufacturing process. Cylindrical casings can be produced using standard extrusion or drawing processes with higher throughput, reducing both production time and skill requirements while the arrangement of multiple cylinders maintains the spherical symmetry.
3Ease of manufacture
If canister shells are used to achieve easier manufacture and louder noise, then the manufacturing ease and sound output are improved, but the symmetrical display appearance is compromised
Solution Approach 1:
The invention merges the advantages of both ball shells and canister shells by combining the cylindrical casing structure of canister shells (which provides ease of manufacture and loud noise) with the spherical outer appearance of ball shells (which provides symmetrical display). The cylindrical casings are joined to form an overall spherical shape, thus integrating the benefits of both designs.
Solution Approach 2:
The shell employs a composite structure consisting of multiple cylindrical casings (providing manufacturing ease and acoustic properties) combined with an outer spherical casing or covering (providing the symmetrical appearance). This composite construction allows each component to contribute its advantageous properties to the final product.
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 allows for a symmetrical pyrotechnic display similar to ball shells with the ease of manufacturing and loud noise of canister shells, reducing the complexity and labor required in producing ball shells.
Implementation Method 1
A lift charge is positioned in the interior volume of the first casing at a location to cause a propelling force to be directed toward the first end of the first casing after the lift charge is ignited
Implementation Method 2
A lead fuse is operatively associated with the lift charge to cause ignition of the lift charge as a result of burning of the lead fuse
Implementation Method 3
A delay fuse is operably associated with the lift charge and the first effects charge to cause the delay fuse to burn by said ignition of the lift charge and thereby cause said ignition of the first effects charge
Implementation Method 4
A first effects charge is positioned in the interior volume of the first casing between the lift charge and the second end of the first casing for creating a first pyrotechnic display when ignited following ignition of the lift charge
Data Source
AI summary
A fireworks aerial display shell is provided with multiple casings of cylindrical configuration that are joined together in end-to-end relationship. Each casing defines an interior volume in which an effects charge is packed. A plug is positioned between the effects charges and has an opening through which an ignition source passes to ignite one of the effects charges as a result of burning of another of the effects charges. An outer casing may surround at least parts of the multiple cylindrical casings and includes multiple partially ball-shaped segments.