Five-Way Keycap Interference Fit for Simpler Assembly
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Solution Overview
Problem
Existing five-way keys have complex assembly processes, high defective rates and costs, poor keycap universality, and the keycap cannot be replaced when damaged.
Innovation Solution
A five-way key design featuring a keycap with at least two clamping ribs on its inner wall, allowing for an interference fit with the push rod, simplifying assembly, reducing costs, and enabling keycap replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glue polyaddition chemical reaction is used to bond keycap and push rod, then bonding is achieved, but assembly process becomes complex and defective rate increases
Solution Approach 1:
The patent replaces the chemical bonding system (glue polyaddition reaction requiring trace water catalysis) with a mechanical bonding system (interference fit between clamping ribs and push rod). This eliminates the complex chemical assembly process while maintaining reliable bonding through pure mechanical interference fit.
Solution Approach 2:
The patent extracts and eliminates the glue bonding step from the assembly process. By designing the clamping ribs with interference fit dimensions that directly match the push rod, the chemical bonding function is removed entirely, simplifying the assembly to a single mechanical insertion operation.
2Ease of manufacture
If glue bonding is used to fix keycap on push rod, then assembly is completed, but cost increases and yield decreases
Solution Approach 1:
The patent substitutes mechanical interference fit for chemical glue bonding, eliminating variables related to glue application, curing time, and chemical reaction consistency. This mechanical approach improves manufacturing yield by removing sources of defect variability while maintaining ease of manufacture through simple assembly operations.
3Stability of the object's composition
If keycap is fixed with glue to push rod, then assembly is stable, but keycap universality is poor and replacement is impossible
Solution Approach 1:
The patent segments the five-way key into separable components (keycap and push rod) connected by mechanical interference fit. This allows the keycap to be detached and replaced independently while maintaining stable assembly during use, achieving both assembly stability and component replaceability that glue bonding cannot provide.
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
Simplifies assembly, reduces costs, improves keycap universality, and allows for keycap replacement, enhancing the overall functionality and durability of the five-way key.
Implementation Method 1
the at least two clamping ribs are arranged on an inner wall of the receiving cavity and are used for clamping a push rod of the five-way key in an interference fit manner
Data Source
AI summary
A five-way key and a display device. A keycap of the five-way key includes a cap body and at least two clamping ribs, where a bottom end of the cap body is provided with an open receiving cavity, and the at least two clamping ribs are arranged on an inner wall of the receiving cavity and are used for clamping a push rod of the five-way key in an interference fit mode. According to the embodiments, the keycap is tightly connected with the push rod of the five-way key in an interference fit mode, so that a user can flexibly and accurately operate the five-way key, the problem complex assembly of existing five-way keys is avoided, and the defective rate is reduced.