Keyboard Stopper Rail Alignment Using Pressing and Positioning
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Solution Overview
Problem
Existing keyboard units face operational failures due to misalignment and interference between mounted members and frames caused by dimensional discrepancies, leading to distorted attachments and compromised functionality.
Innovation Solution
A keyboard unit design featuring a stopper rail with a first member having reduced rigidity in one direction and enhanced rigidity in another, utilizing pressing portions and positioning elements to stabilize the attachment of the stopper rail to the frame, preventing positional deviations and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the through hole size is made larger than the fastener size to accommodate dimensional differences, then the mounted member can be attached to the frame, but positional deviations occur during fastening leading to operational failures
Solution Approach 1:
The pressing portion acts as an intermediary element between the mounted member and the first member. It presses the first member in the second direction to suppress movement in the first direction, thereby preventing positional deviations during fastening while allowing the through hole to be sufficiently large for easy attachment
Solution Approach 2:
The positioning portion is designed to preliminarily constrain the mounted member's position before the actual fastening operation. By providing a positioning hole that fits the positioning pin, the system pre-establishes accurate positional alignment, preventing deviations that would occur during the fastening process
2Ease of manufacture
If the through hole size is made larger than the fastener size to accommodate dimensional differences, then the mounted member can be attached to the frame, but interference with adjacent components occurs
Solution Approach 1:
The pressing portion serves as a mediator that stabilizes the first member's position by suppressing its movement in the first direction. This prevents the mounted member from shifting during fastening, thereby avoiding interference with adjacent components while maintaining the through hole size necessary for easy attachment
3Ease of operation
If the rigidity of the first member is reduced in the first direction to allow pressing, then movement suppression is achieved, but structural strength may be compromised
Solution Approach 1:
The first member is designed with non-uniform rigidity characteristics: it has sufficient rigidity in the second direction to maintain overall structural strength, but reduced rigidity in the first direction to allow the pressing portion to effectively suppress movement. This localized difference in rigidity properties enables both pressing operability and structural integrity
Data Source
AI summary
A keyboard unit includes a frame; a first member connected to the frame, a rigidity of the first member in a first direction being lower than a rigidity of the first member in a second direction intersecting with the first direction; and a mounted member. The mounted member includes a first pressing portion configured to suppress a movement of the first member in the first direction by pressing a part of the first member in the second direction, and a positioning portion configured to suppress a movement of the mounted member with respect to the frame in the first direction.