Hemispherical String Tensioner for Compact Instruments
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Solution Overview
Problem
Conventional string tuners, including peg and worm gear tuners, face challenges in fitting compact instruments without headstocks and offer limited mounting options and string clamping ability, restricting pull direction to a single plane, whereas axial pull tuners are complex and limited in directionality.
Innovation Solution
A hemispherical pull string tension mechanism featuring a receiving component with a horn-shaped opening and an externally threaded rotating component that allows string tension adjustment in any direction within a 360-degree hemisphere, providing a simple and compact solution with versatile installation options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional peg or worm gear tuners are used, then precise tension adjustment is achieved, but they are difficult to fit onto compact instrument body geometry and have limited mounting options
Solution Approach 1:
The tuner mechanism allows dynamic adjustment of the string tension by rotating the external threaded component, which moves the internal component along the threaded path. This dynamic mechanism provides precise tension control while the overall assembly can be mounted in various positions on the instrument body, adapting to different geometries.
Solution Approach 2:
The invention transitions from conventional two-dimensional peg tuners to a three-dimensional axial pull configuration. The external threaded component rotates around the string axis, creating a spherical surface of possible pull directions. This dimensional change allows the tuner to accommodate various mounting positions and string routing configurations on compact instruments.
2Adaptability or versatility
If axial pull tuners are used to fit instrument body geometry, then mounting flexibility is improved, but the devices become complex and limited in directionality
Solution Approach 1:
The tuner is divided into distinct functional segments: an external threaded rotating component for user interaction, an internal component with threaded borehole for string passage, and a low friction component for string attachment. This segmentation allows each part to perform its specific function efficiently while keeping the overall design relatively simple and modular.
Solution Approach 2:
The low friction component acts as an intermediary between the rotating external component and the string. It allows the external component to rotate for tension adjustment while minimizing friction that would otherwise resist the string's movement or rotation, thereby simplifying the overall mechanism while maintaining functionality.
3Strength
If conventional tuners are used, then string clamping ability is provided, but pull direction is limited to a single 360 degree plane perpendicular to the string attachment peg
Solution Approach 1:
The invention extends the pull direction from a single planar 360-degree rotation to a three-dimensional spherical surface. The external threaded component can rotate in any direction around the string axis, and the internal component can be positioned at various angles, creating a hemisphere of possible pull directions. This dimensional expansion provides both strong clamping ability and versatile directional control.
4Ease of operation
If axial pull tuners are used, then pull direction is limited mostly in line with the tuner axis, but this restricts string routing options
Solution Approach 1:
The tuner mechanism dynamically adjusts the pull direction by allowing the external threaded component to rotate freely around the string axis. This dynamic capability enables the string to be routed in various directions while maintaining simple axial operation, as the user only needs to rotate the external component rather than maneuver it through complex paths.
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 string tension adjustment in any direction within a hemisphere, offering improved flexibility and compatibility with various instrument geometries while maintaining precision and ease of use, comparable to worm gear tuners.
Implementation Method 1
a low friction component attached to the end of the knob. This low friction component provides for attachment of the string that passes through both previously described components. The purpose of the low friction component is to allow the rotating component to turn for tension adjustment while the string rotation remains inconsequential.
Data Source
AI summary
The present invention relates to a axial movement tuner that pulls an instrument string in any direction within hemispherical space where the string exits the tuner. The tuner is an adjusting thumbscrew that has a through borehole for string passage and a low friction bearing recessed within the thumbscrew knob, where instrument strings are installed by simply passing them through the thumbscrew bearing, on through the hole in the thumbscrew, and out through a horn shaped opening. Ball end string movement is stopped when the ball reaches the small diameter bearing hole. Tuning is accomplished by turning the thumbscrew causing axial movement of the string end ball while the bearing limits string rotation, and this axial movement of the string within the tuner is redirected by a smooth horn shaped opening to any direction within a hemispherical space defined by the tuner string exit opening.