Drum Hoop Distortion Control via Localized Thinning and Rolled Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drum hoops suffer from distortion during construction and assembly, leading to inaccuracy in tuning and damage to drumsticks due to sharp edges, and issues with water accumulation and interference with drumsticks during use.
Innovation Solution
A drum hoop structure with a reduced thickness bend near the edge, formed by milling one side of a metal strip before rolling, to prevent distortion and damage, featuring a rolled outer edge for strength and a gap for water drainage, along with sideward projections for tensioning rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard thickness drum hoops are used, then structural strength is maintained, but distortion occurs during bending and assembly leading to tuning inaccuracy
Solution Approach 1:
The patent applies local quality by creating a reduced thickness bend area specifically at the hoop's bending zone while maintaining full thickness in other critical areas. This localized thinning allows the bend section to be more pliable and form without distortion, while the rest of the hoop retains its structural strength for withstanding drum tension.
Solution Approach 2:
The patent segments the hoop into distinct thickness zones: a reduced thickness bend area for forming operations, and full thickness areas for structural support. This segmentation allows different parts of the same component to have different properties optimized for their specific functions.
2Ease of manufacture
If sharp edges are present on drum hoops, then manufacturing is simpler, but severe damage occurs to drumsticks during impact
Solution Approach 1:
The patent applies spheroidality by replacing sharp edges with rounded contours on the hoop. The rounded edges eliminate the harmful sharp points that damage drumsticks, while the curvature is achieved through rolling or forming processes that create smooth transitions without compromising manufacturing feasibility.
3Strength
If solid hoop structure is used, then strength is maintained, but water and particles accumulate under the hoop
Solution Approach 1:
The patent applies the porous materials principle by incorporating drainage features that create controlled openings or channels in the hoop structure. These features allow water and particles to pass through or drain away, preventing accumulation while the overall structural integrity is maintained through proper design of the drainage openings.
4Manufacturing precision
If reduced thickness bend is formed, then distortion-free bending is achieved, but hoop strength is reduced
Solution Approach 1:
The reduced thickness bend achieves distortion-free formation by making the bend area thinner and more pliable. The local quality change in thickness allows this specific area to be formed accurately while the rest of the hoop maintains full strength through its standard thickness.
Data Source
AI summary
A method of forming a drum hoop is described and shown. The method can include forming connecting portions into ends of a strip of hoop material. The strip of hoop material can then be rolled such that the connecting portions interconnect. The method can also include forming an elongated edge of the strip and/or hoop of material into a rolled bend, such as a rolled bend toward the outside of the hoop. Finally, the method can include leveling the top and/or bottom surfaces of the hoop, such as leveling the rolled bend. This leveling can be accomplished by stamping one or both of the top and bottom surfaces of the hoop, the top surface in some embodiments being the top of the rolled bend.