Selectable String Capo With Plunger Mechanism
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Solution Overview
Problem
Conventional capos cannot easily set a first set of strings as engaged by default and a second set as disengaged by default, while allowing selective engagement and disengagement of a subset of strings at the neck position occupied by the capo during performance.
Innovation Solution
A spring-loaded clamp type capo with a pivot mechanism, upper and lower clamp arms, and a plunger system that allows for adjustable string engagement and disengagement, enabling default settings and selective tuning adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional capo is fitted to the neck to engage certain strings by default, then those strings are held at the desired pitch, but the musician cannot selectively engage or disengage a subset of strings at that same neck position during performance
Solution Approach 1:
The capo is divided into multiple independent clamp arms (first clamp arm and second clamp arm), each capable of independently engaging or disengaging specific strings. This segmentation allows selective control of different string groups while maintaining the overall capo structure, resolving the contradiction between versatility and complexity.
Solution Approach 2:
The clamp arms are designed with movable joints and springs that allow dynamic adjustment during performance. The first clamp arm can be positioned to engage certain strings by default, while the second clamp arm can selectively engage or disengage other strings at the same neck position, enabling real-time adaptability without permanently fixing the structure.
2Adaptability or versatility
If a capo engages all strings at a given neck position, then the pitch is uniformly raised, but the musician cannot achieve dropped-D tuning where the low E string remains disengaged while other strings are engaged
Solution Approach 1:
The clamp arms are further segmented with individual string contact points or small groups of contact points on each arm. This allows the musician to engage specific strings (e.g., A, D, G, B, E) while leaving others (e.g., low E) disengaged, achieving dropped-D tuning and other configurations without complex operations.
Solution Approach 2:
Different portions of the clamp arms have different engagement characteristics - some areas are designed to contact specific strings while leaving others untouched. This local differentiation enables precise control over which strings are engaged at each neck position, making various tunings accessible with simple arm positioning.
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
Enables musicians to achieve desired tunings like dropped-D tuning by default while allowing for dynamic adjustments to specific strings, enhancing musical flexibility and performance capabilities.
Implementation Method 1
spring-loaded clamp type capo
Implementation Method 2
arm spring (180), preferably a torsion spring, engages the upper clamp arm (130) and the lower clamp arm (150) and urges the respective pads (140, 160) together about the pivot (170)
Implementation Method 3
The upper clamp arm (130) and the lower clamp arm (150) pivot together about a pivot (170). The upper arm handle (135) and the lower arm handle (155) may be squeezed together against the force of the arm spring (180) to open the capo (100) to receive the neck of an instrument.
Data Source
AI summary
A selectable string capo allows a musician to engage one or more strings selectively while the capo is connected to a stringed instrument, while leaving one or more strings disengaged. The capo has at least one plunger and a finger lever allowing a musician to depress the plunger during performance so as to cause the plunger to engage one or more strings. When the finger lever is released, the plunger disengages from the string or strings.