Keyboard Instrument Fallboard Shielding Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fallboard arrangements for keyboard instruments have limited design freedom and risk appearance degradation due to the need to prevent large gaps between the fallboard and the instrument body during sliding, which can hinder smooth operation and introduce foreign matter.
Innovation Solution
A fallboard arrangement featuring left and right shield members that extend downward from the fallboard to shield gaps between the fallboard and the instrument body, allowing for enhanced design flexibility while maintaining smooth operation and appearance quality, with protruding members engaging guide grooves for sliding and reducing assembly complexity and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper edges of the arms and the front guide grooves are limited in positional relationship and shape to prevent large gaps during fallboard sliding, then good appearance and smooth operation are ensured, but the degree of freedom of design is reduced
Solution Approach 1:
A shield member is introduced as an intermediary component between the arm and the fallboard. The shield member has a guide groove that engages with a protruding member on the fallboard, while the shield member itself is guided by the arm's guide groove. This intermediary structure allows the arm's guide groove to have greater design freedom while still preventing large gaps through the coordinated action of multiple components.
Solution Approach 2:
The guiding function is segmented into two stages: the arm's guide groove guides the shield member, and the shield member's guide groove guides the fallboard's protruding member. This segmentation allows each component to be optimized independently, enabling the arm's guide groove to have greater design freedom while the shield member compensates for any gaps.
2Shape
If the upper edges of the arms and the front guide grooves are limited in positional relationship and shape to prevent large gaps during fallboard sliding, then good appearance is ensured, but the degree of freedom of design is reduced
Solution Approach 1:
The shield member acts as a mediator that decouples the appearance requirement from the arm's guide groove design. The shield member can be shaped to maintain good appearance while the arm's guide groove is free to be designed according to structural requirements, as the shield member fills and conceals any gaps.
3Adaptability or versatility
If shield members are used to shield gaps between the fallboard and the instrument body, then design freedom is enhanced and appearance is maintained, but the structure becomes more complex
Solution Approach 1:
The shield member is designed to perform multiple functions simultaneously: it shields gaps for appearance, guides the fallboard's protruding member through its own guide groove, and is itself guided by the arm's guide groove. This multi-functionality reduces the need for separate components, thereby limiting the increase in structural complexity despite enhanced design freedom.
4Shape
If shield members are used to shield gaps between the fallboard and the instrument body, then appearance quality is maintained, but the structure becomes more complex
Solution Approach 1:
The shield member serves multiple purposes: maintaining appearance quality by shielding gaps, guiding the fallboard movement through its guide groove, and being guided by the arm. This consolidation of functions into a single component means that while appearance quality is improved, the structural complexity increases only modestly compared to adding separate shielding and guiding components.
Data Source
AI summary
A fallboard arrangement for a keyboard instrument, including a slide-type fallboard and enabling enhancing the degree of freedom of design while ensuring good appearance and smooth opening and closing operation of the fallboard, to improve marketability. A fallboard opens and closes a performance section. Arms have respective guide grooves for guiding sliding of the fallboard in a front-rear direction. Left and right side plates are provided for left and right ends of a front portion of the fallboard, and have shield walls for shielding areas around left and right end faces of the fallboard, respectively. Left and right guide bushes protrude outward from the side plates, for engagement with the guide grooves of the respective arms. The guide bushes are guided by the guide grooves of the respective arms during sliding of the fallboard in the front-rear direction.