Rotating String Cartridge Assembly for Guitar Body
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Musicians face inconvenience and bulk when replacing strings on stringed instruments, especially in live settings, due to the need to carry multiple spare strings of different gauges, and there is a lack of a specific string-replacement assembly for non-fretted instruments.
Innovation Solution
A string-replacement assembly with cartridges containing replacement strings, each rotatably mounted on spools within the instrument's inner cavity, allowing easy advancement and locking to prevent backward movement, enabling quick replacement of broken strings without the need for multiple spares.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a musician carries multiple spare strings of different gauges to ensure adequate supply, then the reliability of string replacement is improved, but the device complexity and portability deteriorate due to the need to carry dozens of separate strings
Solution Approach 1:
The patent combines multiple individual string replacement functions into a single integrated assembly. The cartridge housing contains multiple spools, each storing a different gauge of string, allowing a musician to carry one compact unit instead of dozens of separate strings. This merging resolves the contradiction by maintaining reliable replacement capability across different gauges while dramatically reducing carrying complexity.
Solution Approach 2:
The cartridge assembly serves multiple functions: it stores and dispenses multiple string gauges, provides a compact portable unit, and includes a locking mechanism for secure string advancement. This multi-functionality allows a single device to replace the need for multiple separate string carrying solutions, improving reliability while reducing overall complexity.
2Stability of the object's composition
If strings are packaged without folds to avoid kinking, then the string integrity is improved, but the ease of operation deteriorates when needing to advance strings from the cartridge
Solution Approach 1:
The patent introduces a dynamic locking mechanism that can be engaged or disengaged as needed. When the locking device is engaged, it secures the string in place to prevent backward movement or kinking. When disengaged, it allows easy advancement of the string from the spool. This dynamic control resolves the contradiction by maintaining string integrity during storage while enabling easy operation during replacement.
Solution Approach 2:
The locking device acts as an intermediary between the string spool and the external environment. It controls the interaction between the user and the string, allowing secure retention when needed and facilitating easy advancement when needed. This intermediary mechanism protects string integrity while maintaining operational ease.
3Reliability
If a locking device is added to prevent string backward movement, then the reliability of string installation is improved, but the device complexity increases
Solution Approach 1:
The locking device is designed to be self-actuating through the natural tension and movement of the string itself. As the string is advanced from the spool, the tension automatically engages the locking mechanism to prevent backward movement. This self-service design improves installation reliability while minimizing the addition of complex external locking components.
Data Source
AI summary
A string-replacement assembly may be installed within an inner cavity of a body of a guitar or non-fretted string instrument. The assembly includes at least one cartridge configured to contain a supply of replacement string therein, corresponding to a particular string gauge for the guitar. Each supply of replacement string is rotatably mounted within a cartridge. A free end of each supply of the replacement string can be threaded through an exit opening in the body of the guitar for installation on a topside of the guitar or non-fretted string instrument. When a string needs to be replaced, a portion of the supply of the replacement string may be readily advanced from a corresponding cartridge to a desired length, and installed in a playing position on the topside of the guitar or non-fretted string instrument, to replace a removed portion of the string.