Stringed Instrument Neck Deflection Correction via Segmented Rod Coupling
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Solution Overview
Problem
Conventional neck deflection correction devices for stringed instruments are prone to failure due to breaking of fixed parts, require frequent replacement, and are limited in correcting both convex and concave deflections.
Innovation Solution
A deflection correction device with a firmer coupling between two rod-like members, using fitting grooves, shaft holes, and a shaft member to distribute load and displacement, allowing for both convex and concave deflection corrections while minimizing the risk of part breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bonding or welding is used to attach the fixing member to the rod-like member, then the coupling strength is improved, but the reliability deteriorates due to breakage from repeated loading
Solution Approach 1:
The fixing member is divided into multiple segments (first fixing member and second fixing member) that can move relative to each other along the rod-like member. This segmentation allows the system to absorb repeated loading cycles without breaking the coupling, as the segments can slide within the groove rather than being rigidly fixed
Solution Approach 2:
A groove structure acts as an intermediary between the fixing member and the rod-like member, allowing controlled movement and load distribution. The groove enables the fixing member to slide along the rod-like member, providing a mechanical interface that maintains coupling while accommodating repeated loading without breakage
2Stability of the object's composition
If the fixing member is rigidly attached to the rod-like member, then the coupling stability is improved, but the adaptability deteriorates in correcting both convex and concave deflections
Solution Approach 1:
The fixing member is designed to move dynamically within the groove of the rod-like member rather than being rigidly fixed. This dynamic capability allows the fixing member to adjust its position to correct both convex and concave deflections while maintaining stable coupling through the groove constraint
3Reliability
If the deflection correction device is replaced frequently, then the reliability is improved, but the loss of time and cost increases
Solution Approach 1:
The groove-based coupling mechanism provides beforehand cushioning against breakage by allowing controlled movement and stress distribution. This preventive design eliminates the need for frequent replacements, saving time and resources that would otherwise be spent on disassembly and reassembly
Data Source
AI summary
A deflection correction device includes a first rod-like member provided in stringed instrument necks; fixing members attached to end parts of the first rod-like member; a screw hole formed so as to pass through the fixing member; and a second rod-like member provided with a screw shaft part screwed in the screw hole, and attached to the fixing member. The fixing members includes fitting grooves fitted on the end parts of the first rod-like member; shaft holes passing through the end parts of the first rod-like member from side surfaces of the fixing members; and a shaft member inserted in the screw holes. The fixing members are fixed to the end parts of the first rod-like member together with the shaft member, and by rotation of the second rod-like member, both the fixing members are pushed in a direction drawn to or away from each other.