Technical Innovations in Accessible Musical Instruments Analysis of Foldable Structures and Harmonic Device Patents

Abstract This technical report examines two patented musical instrument innovations designed to reduce physical and technical barriers in music education and care environments: the Foldable String Instrument Structure (Patent No. I 903394) and the Harmonic Picking Device (Patent No. I 891530). The study analyzes engineering strategies that balance acoustic resonance, structural stability, and portability to support mobile music classrooms and on-site interventions. Additionally, it describes a zero-barrier harmonic mechanism enabling individuals without musical training, including those with cognitive or physical limitations, to produce consonant sound with minimal effort. Practical applications in special education and long-term care contexts are discussed. Keywords musical instrument innovation patent analysis foldable instrument harmonic device universal design music accessibility Main Content Structure Background: Limitations of traditional string instruments Patent I 903394: Foldable structures and acoustic integrity Patent I 891530: Automated harmonic logic for non-musicians Applications: Mobile education, special education, and care environments. Note: This working paper has been integrated into a unified core framework:Lai, W. Y. (2026). A Holistic Lifespan Model of Harp- and Piano-Based Music Education and Assistive Therapy. Zenodo. https://doi.org/10.5281/zenodo.18495745