Drum Hoop Rolled Edge and Drainage Gap Design
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Solution Overview
Problem
Existing drum hoops suffer from drainage issues and interference with drumsticks during rim shots, leading to damage and accumulation of water and particles.
Innovation Solution
An improved hoop configuration featuring a rolled edge to prevent drumstick damage and a drainage gap between the hoop and its side wall, with the gap concealed beneath an arcuate edge, along with a flange and sideward projections for tensioning rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight edge or slight radius is used on the drum hoop, then the hoop structure is simple and easy to manufacture, but it causes severe damage to drumsticks during impact
Solution Approach 1:
The patent applies curvature by rolling the hoop edge to form a rounded surface with a radius of curvature between 1/8 inch and 1/4 inch. This curved configuration replaces the straight or slightly radiused edge, distributing the impact force across a broader area and preventing concentrated stress that damages drumsticks, while maintaining manufacturing feasibility through standard rolling processes
2Object-affected harmful factors
If the hoop edge is rolled to prevent drumstick damage, then drumstick protection is improved, but the hoop edge may become less flat and affect drum performance
Solution Approach 1:
The patent applies local quality by differentiating the hoop's structural zones: the rolled edge portion (1/8-1/4 inch radius) provides protective curvature where drumsticks contact, while the main hoop body maintains its structural integrity and flatness. This localized modification ensures drumstick protection without compromising the overall hoop flatness or structural performance
3Strength
If the hoop edge is rolled toward the outer side to increase strength, then hoop strength and stability are improved, but the gap for drainage may be reduced or eliminated
Solution Approach 1:
The patent resolves this contradiction by transitioning the drainage gap from a lateral opening to a longitudinal feature. The rolled edge is formed with a radius that creates an inherent longitudinal gap along the hoop's length, allowing water and debris to drain through the rolled portion itself. This dimensional change maintains the strength benefits of rolling while preserving drainage functionality
4Reliability
If the drainage gap is provided to face the outer side wall for water egress, then drainage function is improved, but it may interfere with drumstick impact during rim shots
Solution Approach 1:
The patent merges the drainage function with the protective rolled edge structure. The gap is formed as an integral part of the rolled edge configuration itself, rather than as a separate feature. This integration ensures that the drainage pathway is positioned within the rolled portion's geometry, eliminating interference with drumstick impact while maintaining effective water and debris egress
Data Source
AI summary
Drum structure comprising, in combination a drum shell and a drum head, and a counter hoop to be supported by the shell proximate the head and having an edge shaped to resist or prevent drum stick damage, there being a drainage gap or opening providing access between the counter hoop and its side wall.