Linear Dovetail Neck Joint for Guitar
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Solution Overview
Problem
Conventional neck joints in stringed musical instruments, such as guitars, lack the ability to be easily adjusted for linear and angular positions, which restricts user adjustments for optimal action and intonation without affecting the tone or sustain, and often require costly modifications or the use of multiple instruments.
Innovation Solution
A linear dovetail neck joint system that allows for quick and easy adjustment of the neck's height and angle relative to the body using internal dovetail and screw-adjustable tension, eliminating the need for adhesives and providing a rigid mechanical connection while maintaining playability and tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a permanent glued neck joint is used, then the neck joint provides strong structural connection and tone transfer, but the neck cannot be adjusted for action and intonation
Solution Approach 1:
The neck joint is divided into separate components: a neck tenon, a body pocket, and an adjustable mechanism with bolts and shims. This segmentation allows the neck to be detached and repositioned, enabling adjustment of action and intonation while maintaining a strong structural connection when assembled.
Solution Approach 2:
The neck joint transitions from a static permanent connection to a dynamic adjustable connection. Bolts and shims enable the neck position to be changed after assembly, providing adaptability for action and intonation adjustments while maintaining structural integrity during play.
2Adaptability or versatility
If a bolt-on neck joint is used, then the neck can be removed and repositioned, but the joint has less side-to-side rigidity and restricts access to upper frets
Solution Approach 1:
The neck tenon features a curved contour that matches the curvature of the body pocket. This curved interface increases side-to-side rigidity and stability compared to traditional straight bolt-on joints, while still allowing for adjustment through the bolt and shim mechanism.
Solution Approach 2:
The neck joint design applies different characteristics to different regions: the tenon contour provides localized curvature for enhanced rigidity at the joint interface, while the overall structure maintains adjustability through strategically placed bolts and shims.
3Strength
If a neck heel extends down to the back of the body, then the neck joint provides support, but access to the highest region of the fretboard is restricted
Solution Approach 1:
The traditional neck heel that extended down to the back of the body is removed. Instead, the neck tenon sits higher on the body surface, extracting the support function from the heel and relocating it to the tenon-body pocket interface, thereby clearing the path for improved upper fret access.
Solution Approach 2:
The neck support function is moved from a vertical extension (heel reaching to the back) to a horizontal interface (tenon fitting into the pocket). This dimensional change eliminates the obstructive heel while maintaining support through the pocket's depth and the bolt connection.
4Device complexity
If conventional neck joints are used, then the structure is simple, but costly modifications are required to adjust action and intonation
Solution Approach 1:
The neck joint includes built-in adjustment mechanisms (bolts and shims) that enable the user to adjust action and intonation without requiring external modifications or professional intervention. The system serves itself by providing all necessary components for adjustment within the joint structure.
Solution Approach 2:
The adjustment mechanism allows changes in key parameters (neck height and angle) through simple bolt and shim adjustments. This enables modification of action and intonation without altering the fundamental joint structure, keeping the design simple while providing adjustment capability.
Data Source
AI summary
A linear dovetail neck joint for a musical instrument having a neck, a body, and a fretboard. The linear dovetail neck joint relies on an internal dovetail with screw-adjustable tension while avoiding screws that go directly into the neck. The linear dovetail neck joint allows for extreme fret accessibility in the upper register of the fretboard (due to lack of heel on the neck), easier neck height adjustments, intonation correction, and unique front block configurations with hand relief—all without the need for adhesives. The linear dovetail neck joint permits a practical and aesthetically pleasing neck-to-body joint without the need for a heel on the neck. The result is a neck-to-body joint that is easily adjustable and serviceable.