Linkage Assembly for Key Switch Positioning
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Solution Overview
Problem
Existing key switch devices lack an efficient mechanism for guiding the movement of a key cap between normal and pressed positions, resulting in inadequate synchronization and retention of the key cap positions.
Innovation Solution
A linkage assembly comprising modular linking members with power and weight segments, fulcrum areas, and synchronizing units that pivotally couple the key cap to a support board, allowing synchronized angular movement and frictional engagement to maintain key cap positions, enabling efficient transition between normal and pressed states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a linkage assembly is designed to guide key cap movement between normal and pressed positions, then the key cap positioning accuracy is improved, but the device complexity increases due to multiple linking members and synchronizing units
Solution Approach 1:
The linkage assembly is divided into modular components including left and right linking members, each with power segments, weight segments, and fulcrum areas. Each segment performs a specific function in guiding the key cap movement, allowing for precise positioning while maintaining manageable complexity through modular design
Solution Approach 2:
The synchronizing units integrate the movement of left and right linking members into a coordinated system. By merging the motion control of multiple arms through shared fulcrum areas and weight segments, the system achieves synchronized key cap positioning without requiring separate control mechanisms for each side
2Stability of the object's composition
If synchronizing units are added to couple left and right arms, then the movement synchronization is improved, but the device complexity increases
Solution Approach 1:
The weight segments are positioned to create balanced gravitational forces on both sides of the linkage assembly. By establishing equipotential conditions through symmetric weight distribution around fulcrum areas, the system achieves natural synchronization of left and right arm movements without requiring complex active control mechanisms
Solution Approach 2:
Weight segments are strategically placed to counterbalance the motion of corresponding arms. The counterweight effect ensures that when one arm moves, the other arm responds in a synchronized manner, maintaining stable composition throughout the key cap's movement between normal and pressed positions
3Reliability
If frictional engagement is used to retain key cap positions, then the position retention reliability is improved, but the energy loss increases
Solution Approach 1:
The frictional engagement between linkage components, which typically represents energy loss, is strategically utilized to provide position retention for the key cap. The friction force naturally locks the key cap in either the normal or pressed position, converting what would be harmful energy dissipation into a beneficial holding mechanism that improves position retention reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The linkage assembly effectively guides the key cap's movement, ensuring precise retention in both positions through synchronized angular motion and frictional engagement, enhancing the operational efficiency and reliability of the key switch device.
Implementation Method 1
the left upward abutment region is brought into frictional engagement with the right downward abutment region to thereby retain the key cap in the pressed position, and such that in response to the upward movement of the key cap, the left downward abutment region is brought into frictional engagement with the right upward abutment region to thereby retain the key cap in the normal position
Data Source
AI summary
A linkage assembly is provided for guiding movement of a key cap relative to a support board. The linkage assembly includes left and right modular linking members, and a pair of synchronizing units each including a left upper cavity, a left lower cavity, a right upper cavity, and a right lower cavity. In a normal position of the key cap, a left downward abutment region of the left lower cavity is in frictional engagement with a right upward abutment region of the right upper cavity. In a pressed position of the key cap, a left upward abutment region of the left upper cavity is in frictional engagement with a right downward abutment region of the right lower cavity.