Flexible Key Stem Structure for Durable Removable Keycaps
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Solution Overview
Problem
Existing keycap mounting systems suffer from difficulty in removal and installation, material wear, and diminished retentive force due to interference fits and crush ribs, leading to potential cracking and instability.
Innovation Solution
A key stem design with flexible or springing members extending from extensions, applying retentive forces to the interior surfaces of the keycap stem to securely hold the keycap, reducing material deformation and maintaining stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference fits and crush ribs are used to retain the keycap, then the keycap is securely held in place, but the removal and installation becomes difficult and material wear occurs
Solution Approach 1:
The key stem is divided into multiple extensions (typically four) that can independently flex outward. This segmentation allows each extension to act as an independent retaining element that can be compressed during installation and then spring back to provide retention force, enabling easy keycap removal and reinstallation while maintaining secure retention.
Solution Approach 2:
The extensions are designed to be flexible rather than rigid, allowing them to dynamically adjust during keycap installation and removal. The extensions can flex outward to reduce retention force for easy removal, then spring back to provide strong retention when the keycap is installed, resolving the contradiction between secure retention and ease of operation.
2Reliability
If tighter interference fits are used to improve retention, then the keycap is held more securely, but the retentive force diminishes after multiple removals and re-installations due to material wear
Solution Approach 1:
The retention mechanism transitions from a static interference fit to a dynamic spring-based system. The flexible extensions maintain a constant retentive force through their elastic properties, compensating for any wear or dimensional variations that occur during repeated installation and removal cycles, thereby maintaining durability over time.
Solution Approach 2:
The flexible extensions are designed to be replaceable components. If wear does occur, the entire key stem assembly can be replaced as a low-cost unit, ensuring long-term reliability without requiring precise maintenance of the retention interface.
3Reliability
If material is added to the key stem to allow for tighter fits, then retention is improved, but the keycap stem risks cracking
Solution Approach 1:
The key stem uses thin, flexible extensions instead of thick rigid material. These flexible walls provide sufficient retention force through elastic deformation while maintaining enough thickness to prevent cracking during normal use and installation processes.
Solution Approach 2:
The flexible extensions dynamically absorb installation forces through elastic deformation rather than rigid resistance. This dynamic response prevents stress concentration and cracking that would occur with rigid, tightly-fitting designs.
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 key stem design provides secure and durable keycap retention with minimal material wear, ensuring consistent retentive forces and easy installation/removal, addressing the deficiencies of prior art designs.
Implementation Method 1
At least one flexible or springing member extends from at least one of the extensions. The at least one flexible or springing member is configured and disposed to apply retentive forces on interior surfaces of a keycap stem
Data Source
AI summary
Presently provided is a keyboard with at least one of the keys having a key stem configured and disposed to interface with, and removably hold, a keycap. The key stem extends upwardly from a keyboard switch or a keycap stabilizer and has two or more extensions extending outwardly from a common center. At least one flexible or springing member extends from or forms at least one of the extensions and applies retentive forces on interior surfaces of a keycap stem extending downwardly from a keycap's interior ceiling and removably holds the keycap with the key stem.