Keyboard Lid Guide Mechanism for Stable Alignment
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Solution Overview
Problem
The existing keyboard lid open and close device for musical instruments is complex and unstable, as it requires a displacement mount section to absorb the drooping movement of the rear guide shaft, leading to intricate structures and unstable lid movements when the front and rear guide shafts are guided by a common guide groove.
Innovation Solution
A keyboard device with a guide groove that includes a guide recess to stabilize the rear guide shaft's drooping movement, allowing the front and rear lids to be on the same plane when closed, using a pressing member and guide mechanism to ensure smooth and stable opening and closing without the need for a displacement mount section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a displacement mount section is provided to absorb the drooping movement of the rear guide shaft, then the rear guide shaft can make a drooping movement, but the structure becomes intricate and complex
Solution Approach 1:
The drooping portion and guide groove are merged into a single integrated structure. The guide groove is formed with a drooping portion that guides the rear guide shaft to make a drooping movement immediately before the keyboard lid is completely closed, eliminating the need for a separate displacement mount section while maintaining the required movement capability.
Solution Approach 2:
The guide groove serves multiple functions: it guides the front guide shaft and rear guide shaft in the forward and rearward direction, and simultaneously provides the drooping portion to guide the rear guide shaft's drooping movement. This multi-functional design reduces the number of separate components needed.
2Device complexity
If the front guide shaft and rear guide shaft are guided by a common guide groove, then one guide groove can move both guide shafts, but the rear lid becomes lifted and the front and rear lids cannot be placed on the same plane
Solution Approach 1:
The guide groove has different cross-sectional shapes at different locations. The drooping portion is formed only at the front portion of the guide groove where the rear guide shaft needs to make a drooping movement, while other portions maintain a standard shape. This localized modification allows precise control of the rear lid's position without affecting the entire guide groove structure.
3Ease of operation
If the displacement mount section is provided to absorb drooping movement, then the rear guide shaft can droop, but the open and close movements of the keyboard lid become unstable
Solution Approach 1:
The drooping portion is pre-formed in the guide groove to anticipate and accommodate the drooping movement of the rear guide shaft. This pre-prepared structural feature ensures that the drooping movement occurs smoothly and predictably, preventing instability during the keyboard lid's closing operation.
Data Source
AI summary
A keyboard device of the present invention includes a front guide shaft that is provided on the front portion of a front lid and projects toward sides of the front lid, a rear guide shaft that is provided on the front portion of a rear lid and projects toward sides of the rear lid, and a guide groove that guides the front guide shaft and the rear guide shaft in the front and back directions of a musical instrument case. The guide groove is provided with a guide recess where the rear guide shaft comes in so that the front lid and the rear lid are placed on the same plane when a keyboard lid is closed and covers a keyboard section.