Pad Ring Retainer for Woodwind Tonehole Sealing
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Solution Overview
Problem
Existing pad assemblies for woodwind instruments, particularly flutes, face issues with uneven contact and air leakage due to imperfect alignment and deformation, caused by variations in soldering, screw threads, and pressure applied during attachment, leading to suboptimal sealing of toneholes.
Innovation Solution
A pad assembly featuring a pad material with a pad ring retainer having a vertical wall and optional inward taper, surrounded by a membrane, which allows for direct shimming and flexible adjustment to ensure precise sealing, eliminating the need for a rigid base and reducing deformation, thus enhancing the seal and accommodating irregularities in toneholes and key cups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a spud and washer design is used to secure the pad, then the pad can be held in place, but alignment and concentricity become imperfect due to soldering variations and screw thread tightness
Solution Approach 1:
The patent removes the spud and washer components from the pad assembly, replacing them with a integrated retaining ring that is directly formed as part of the pad structure. This extraction of unnecessary components eliminates the sources of alignment error (soldering variations, thread tightness) while maintaining pad retention through the retaining ring's engagement with the cup's retaining groove.
Solution Approach 2:
The retaining ring is merged with the pad structure, forming an integrated assembly where the ring is directly attached to or formed as part of the pad. This merging eliminates the separate spud and washer components, reducing the number of interfaces where misalignment can occur and improving overall manufacturing precision while maintaining secure attachment.
2Strength
If a bushing is pressed into the center hole of the pad, then the pad can be held in the cup, but the cup becomes deformed due to excessive pressure
Solution Approach 1:
The patent eliminates the bushing component and the center hole from the pad design. Instead, the retaining ring engages with a retaining groove formed in the cup wall, distributing the retention force along the groove rather than concentrating it in a central pressing action. This extraction prevents cup deformation while maintaining secure pad retention.
Solution Approach 2:
The retention mechanism is shifted from a vertical pressing action (bushing into center hole) to a circumferential engagement (retaining ring in retaining groove). This dimensional change from axial to radial retention distributes forces more evenly and prevents the localized deformation that occurs with central pressing.
3Strength
If a rigid base is used in the pad assembly, then structural support is provided, but deformation occurs and precise sealing becomes difficult
Solution Approach 1:
The patent replaces rigid base structures with flexible retaining ring and membrane components. The retaining ring can elastically deform to accommodate minor variations in cup geometry, and the membrane provides flexible sealing contact. This flexibility eliminates deformation issues while maintaining structural support and improving sealing precision through adaptive conforming to the tonehole surface.
Data Source
AI summary
A pad for a woodwind instrument is provided. The pad is formed of a pad material, and a pad ring retainer about a perimeter side edge of the pad material. The pad ring retainer is adapted to support the pad material as well as any membrane which encloses the pad material. As constructed, the pad utilizes the ring retainer as a type of internal skeleton to support the pad but also provide added flexibility and versatility to the pad.