Adjustable Guitar Neck Bracket for String Action
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Solution Overview
Problem
Traditional acoustic guitars face challenges in maintaining consistent intonation and string action due to the progressive increase in string to fret distance, leading to pitch variations and increased string tension, which complicates neck adjustment and requires frequent maintenance, especially in wood instruments.
Innovation Solution
A three-legged neck-to-body attachment bracket with an adjustable turnbuckle strut member allows for arbitrary adjustment of string action height without affecting intonation, enabling simultaneous compensation for scale length and intonation changes, and can be done under tuned string tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional wood working techniques (mortise and tenon, dovetail) are used to join neck to body, then the joint provides structural strength, but the neck angle cannot be adjusted and requires intensive labor reworking to correct string action height
Solution Approach 1:
The neck-to-body joint is segmented into separate adjustable components: a neck block with heel, a body block with pocket, and an independent adjustment mechanism (screw or lever) that allows the neck angle to be modified without replacing the entire joint structure. This segmentation enables adjustability while maintaining structural integrity.
Solution Approach 2:
The joint transitions from a static traditional wood working connection to a dynamic adjustable connection. The incorporation of screws, levers, or other adjustment mechanisms allows the neck angle to be dynamically changed to compensate for bridge lift and maintain proper string action height throughout the instrument's lifetime.
2Ease of operation
If bridge saddle height is increased to compensate for bridge lift, then string action height improves, but intonation becomes inaccurate due to changed string to fret distance
Solution Approach 1:
The system transitions from a fixed bridge saddle height to a dynamically adjustable neck angle. By changing the neck angle rather than the bridge saddle height, the string action is corrected without altering the string to fret distance, thereby maintaining accurate intonation while improving playability.
Solution Approach 2:
The problem of string action height is extracted from the bridge saddle adjustment domain and relocated to the neck angle adjustment domain. This separation allows independent optimization of string action height without compromising intonation, as the fret positions remain fixed while the neck angle compensates for bridge lift.
3Ease of operation
If neck angle is adjusted to maintain proper string action, then playability improves, but the joint structure becomes more complex requiring additional components
Solution Approach 1:
The joint is segmented into functional modules: structural components (neck block, body block) and adjustment components (screw, lever, or other mechanism). This segmentation allows the adjustment function to be added with minimal impact on the overall joint structure, maintaining simplicity while enabling playability optimization.
Solution Approach 2:
The adjustment mechanism is designed to be self-contained within the joint structure, using the existing neck and body blocks as part of the adjustment system. The screw or lever mechanism utilizes the available space and structural elements, avoiding the need for entirely separate adjustment apparatus and minimizing added complexity.
4Ease of manufacture
If traditional fixed joint is used, then manufacturing is simpler, but frequent maintenance and neck resets are required due to bridge lift
Solution Approach 1:
The static fixed joint is replaced with a dynamic adjustable joint that can compensate for bridge lift over time. This eliminates the need for frequent neck resets and major maintenance interventions, as the neck angle can be easily adjusted to maintain proper string action height throughout the instrument's lifetime.
Solution Approach 2:
The joint incorporates a user-accessible adjustment mechanism that allows owners to perform maintenance themselves without requiring professional luthier intervention. The screw or lever adjustment can be made by the owner to compensate for bridge lift, significantly reducing maintenance frequency and cost.
Data Source
AI summary
This apparatus and system provides an acoustic hollow body guitar which allows for the careful adjustment of the instrument neck to body relative angle of inclination and thus the string to fret distance (action height). This adjustment has the capability of being accomplished while the guitar is in the tuned state and in the playing position. The traditional wood jointing is abandoned and replaced by a guitar neck to body hinge-less mounting bracket assembly apparatus. This system employs a single adjusting nut/dial that is accessed through either/and a port in the side of the upper bout or the sound-hole.