Keyboard Device with Bent Connection Part for Weight Nesting
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Solution Overview
Problem
Existing keyboard devices for keyboard instruments, such as electronic pianos, face challenges in being compact while maintaining an appropriate key-touch weight due to the protrusion of hammer weights towards the rear, which increases the device's dimensions in both the front-rear and vertical directions.
Innovation Solution
A keyboard device design featuring a hammer with a weight that enters a space within a bent connection part, allowing for a larger weight without increasing the device's size, and a shape that reduces the pivotal movement range and upper space dimensions, along with a support member and restrictor to prevent contact and movement restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the weight on the rear end of the hammer protrudes significantly toward the rear-end side of the keyboard chassis, then the key-touch weight is appropriate, but the dimension of the keyboard device in the front-rear direction becomes large
Solution Approach 1:
The weight is nested within the connection part structure. The connection part has a bent shape that creates an internal space where the weight is accommodated, allowing the weight to be contained within the overall structure rather than protruding outward. This resolves the contradiction by providing appropriate key-touch weight through the nested weight while maintaining a compact front-rear dimension through the containing structure.
2Force
If the height of the keyboard device is increased to arrange the hammer with the large-sized weight in the lower part, then the key-touch weight is appropriate, but the keyboard device becomes difficult to make compact
Solution Approach 1:
Instead of increasing the vertical height to accommodate the weight, the design utilizes the bent connection part structure that creates horizontal and diagonal space utilization. The bent shape redirects the weight accommodation into a different spatial arrangement, avoiding vertical expansion while still providing sufficient space for the weight to achieve appropriate key-touch weight.
3Ease of manufacture
If the connection part is made straight to simplify the structure, then the manufacturing is easier, but the weight cannot be accommodated within the compact structure
Solution Approach 1:
The connection part employs a bent shape with curved geometry instead of a straight configuration. This curvature creates internal void space within the bent structure that can accommodate the weight. The bent shape is manufactured as an integrated component, maintaining ease of manufacture through standard forming processes while successfully creating the necessary accommodation space for the weight.
Data Source
AI summary
A keyboard device is provided. The keyboard device includes a keyboard in which keys are provided so as to be each pivotally movable, a hammer configured to be pivotally moved at key-pressing, and a keyboard chassis that supports the keyboard and the hammer. The hammer includes a weight on its rear-end side. Each key includes a key body, a fixing part, and a connection part that connects a rear end of the key body and the fixing part to each other. The connection part has a structure bent so as to protrude upward and contains, on a lower inside of the connection part, a space where the weight on the rear-end side of the hammer is allowed to enter at key-pressing.