Keyboard Lid Mechanism for Stable Upright Positioning
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Solution Overview
Problem
Existing keyboard lid opening and closing apparatuses for keyboard instruments, such as pianos and organs, face issues with smooth folding and stable upright positioning due to uneven plate sizes, leading to bothersome operation and instability.
Innovation Solution
A keyboard lid opening and closing apparatus featuring a coupling member connecting a front lid and a rear lid with rotary fulcrum sections and guide sections, allowing for stable and smooth opening and closing by rotating the rear lid and guiding the front lid to maintain upright positioning, even when lengths differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the plurality of plates are formed in the same size, then the structure is simple, but the plates cannot be smoothly folded and do not stand upright stably
Solution Approach 1:
The patent applies local quality by making the front lid and rear lid have different lengths (front lid is longer), which allows each lid to be optimized for its specific folding path and positioning function, thereby enabling smooth folding and stable upright positioning while maintaining manufacturing feasibility
2Ease of manufacture
If the plurality of plates are formed in the same size, then the structure is simple, but the upper portions easily tilt in the front-rear direction when held upright
Solution Approach 1:
The patent applies local quality by making the front lid and rear lid have different lengths (front lid is longer), which allows each lid to be optimized for its specific folding path and positioning function, thereby enabling smooth folding and stable upright positioning while maintaining manufacturing feasibility
3Ease of operation
If the keyboard lid is structured with multiple plates of different sizes, then the folding becomes bothersome, but the plates must be sequentially unfolded and folded
Solution Approach 1:
The patent applies segmentation by dividing the keyboard lid into multiple lids (front lid and rear lid) with different lengths, where each lid is responsible for a specific folding segment. This segmentation allows each lid to be optimized for its specific folding path, making the overall folding operation smoother despite the different sizes
Data Source
AI summary
The present invention includes a keyboard lid which is constituted by a front lid and a rear lid whose lengths in the front-rear direction of a keyboard section provided in an instrument case are different from each other being foldably connected to each other by a coupling member, and openably and closably covers the keyboard section; a rotary fulcrum section which supports the rear end portion of the rear lid such that the rear lid is rotatable with respect to the instrument case, and by which the keyboard lid is mountain-folded and the front lid is held upright above the rear portion of the keyboard section when the keyboard lid exposes the keyboard section; and a guide section which guides the front end portion of the front lid in the front-rear direction of the keyboard section. Accordingly, the keyboard lid can be stably and smoothly opened or closed.