Ramped Contact Pad for Twelve-String Guitar Capo
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Solution Overview
Problem
Conventional capos for twelve-string guitars require excessive clamping force to ensure proper contact and pitch adjustment, leading to tuning issues and string muting, especially when quickly changing capo positions during performance.
Innovation Solution
A capo with a resilient contact pad featuring a series of ramps with shallow and sharp inclined surfaces allows simultaneous contact with adjacent light and heavy gauge strings, reducing the need for excessive compression and accommodating string divergence, enabling secure and even clamping without retuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If greater clamping force is applied to ensure proper contact of lighter gauge strings, then clear tone is achieved, but strings are pulled out of tune and excessive compression is required
Solution Approach 1:
The contact pad is divided into multiple zones with different ramp configurations: shallower ramps for lighter gauge strings (E, B) and steeper ramps for heavier gauge strings (G, D, A). This local differentiation allows each string type to be contacted at the appropriate angle without requiring excessive overall clamping force, resolving the contradiction between achieving clear tone and maintaining tuning stability.
Solution Approach 2:
The contact pad surface is segmented into multiple discrete ramp structures rather than a single flat surface. Each ramp is positioned to contact a specific string or string pair, allowing independent optimization of contact geometry for different string gauges. This segmentation enables proper contact for all strings without requiring excessive compression force.
2Device complexity
If conventional flat contact pad is used, then simple structure is maintained, but strings cannot be contacted simultaneously without excessive compression
Solution Approach 1:
The contact pad features curved ramp surfaces instead of flat planes. The concave curvature of each ramp allows it to conform to the divergence of strings as they extend from the nut toward the bridge, enabling simultaneous contact with multiple strings at appropriate angles without requiring excessive clamping force.
Solution Approach 2:
The contact pad geometry transitions from a two-dimensional flat surface to a three-dimensional structured surface with multiple inclined ramps. This dimensional change allows the contact surfaces to be positioned at different heights and angles, accommodating string divergence and enabling effective contact with both light and heavy gauge strings simultaneously.
3Productivity
If capo is re-positioned during performance, then pitch adjustment is achieved, but time-consuming adjustment and retuning is required
Solution Approach 1:
The ramped contact pad structure is designed to automatically adapt to string positions when the capo is moved to different locations on the neck. The inclined surfaces self-adjust to maintain proper contact angles with the strings regardless of the capo's position, eliminating the need for manual repositioning of contact surfaces or retuning after relocation.
Solution Approach 2:
The ramp angles and geometries are specifically designed to accommodate the natural divergence of strings across different positions on the guitar neck. This parameter optimization ensures that the contact geometry remains effective whether the capo is positioned at the first fret or higher up the neck, maintaining tuning stability and clear tone across all positions without requiring adjustment.
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
The capo provides quick and secure pitch adjustment with minimal user adjustment, maintaining clear tone and relative tuning across different capo positions, while accommodating varying string gauges and configurations.
Implementation Method 1
a resilient contact pad featuring a series of ramps with shallow and sharp inclined surfaces allows simultaneous contact with adjacent light and heavy gauge strings
Data Source
AI summary
A capo (10) suitable for a twelve string guitar, where string pairs of different gauges are used. The capo (10) includes a clamp arm (11) with a contact surface (12) for contacting the strings that includes a plurality of inclined portions (18) relative to a lateral extent of the clamp arm (11). The nature of the inclined portions (18) is such that adjacent strings (1st to 6th) of different gauges can be contacted with relatively even pressure upon the fingerboard (21).