Rectangular Double-Action Truss Rod for Guitar Neck Curvature
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Solution Overview
Problem
Conventional truss rods for stringed instruments are limited in their ability to adjust neck curvature, often only allowing adjustment in a single direction, and can cause twisting or permanent damage due to their bulky and heavy design, which affects the instrument's playability.
Innovation Solution
A double-action truss rod with a rectangular cross-sectional shape, constructed from lightweight materials like aluminum, that can bend in multiple directions (forward, backward, right, and left) and is configured to maintain neck straightness, using a dual-pitch adjustment mechanism to adjust curvature at specific frets along the neck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a round cross-sectional truss rod is used, then the truss rod can rotate inside the neck allowing adjustment in multiple directions, but the neck can twist and bend in right and left directions causing permanent damage
Solution Approach 1:
The truss rod cross-section is changed from a round shape to a rectangular shape with specific dimension ratios (width-to-depth ratio between 0.5:1 and 0.8:1). This asymmetric design allows the rod to be inserted and adjusted in the neck while preventing rotation, thereby eliminating the ability to bend in right and left directions and preventing permanent damage to the neck.
2Adaptability or versatility
If a double action truss rod is used to adjust neck curvature in forward and backward directions, then the neck can be adjusted in multiple directions, but the truss rod becomes bulky and heavy adding undesirable weight to the instrument
Solution Approach 1:
The truss rod employs a rectangular cross-section with optimized dimension ratios (width-to-depth ratio between 0.5:1 and 0.8:1) to achieve double-action curvature adjustment capability. This geometric parameter optimization allows the rod to provide adjustment in forward and backward directions while maintaining a compact, lightweight profile that does not add excessive weight to the instrument.
3Device complexity
If a single action truss rod is used, then the truss rod structure is simple, but the adjustment options are limited and may not be sufficient to adjust the neck into a desired shape
Solution Approach 1:
The rectangular cross-sectional design with specific width-to-depth ratios provides a simple yet effective structure that enables double-action adjustment capability. The asymmetric geometry allows the truss rod to be inserted and adjusted in the neck while preventing rotation, thereby eliminating the ability to bend in right and left directions and preventing permanent damage to the neck.
Data Source
AI summary
A truss rod for use with a neck body of a musical instrument. The truss rod includes a first rod connected to a second rod. An adjustment member is connected to the first rod and configured to exert a longitudinally directed force on the first rod that causes the first rod to move longitudinally with respect to the second rod. This movement exerts a laterally directed force on the second rod that causes the second rod to exert a laterally directed force on the neck body to thereby change the curvature of the neck body. The adjustment member may threadedly engage the first rod and exert the longitudinally directed force on the first rod by threading into or out of the first rod. The adjustment member may also threadedly engage the second rod. Different thread pitches may be used to threadedly engage the adjustment member with the first and second rods.