Replaceable Keypad Label With Barbed Locking Mechanism
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Solution Overview
Problem
Existing keypads lack adaptability in changing visual cues and fail to provide mechanical and tactile feedback, especially when designed to be sealed from environmental hazards, making them inconvenient for use in heavy-duty or hazardous applications.
Innovation Solution
A keypad design featuring a main piece and a switch actuating piece with a removable label component secured by a barbed locking mechanism, allowing for easy label replacement and maintaining key functionality, while the elastomeric membrane provides protection against environmental hazards and tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a continuous keypad covering made of flexible material is used to seal against environmental hazards, then protection against environmental hazards is improved, but mechanical and tactile feedback when actuated deteriorates
Solution Approach 1:
The key is divided into a flexible membrane portion integrated with the keypad covering and a rigid label component portion. This segmentation allows the membrane to provide sealing while the rigid label provides mechanical feedback, resolving the contradiction between environmental protection and tactile response.
Solution Approach 2:
The key combines flexible material (membrane) with rigid material (label component) in a single integrated structure. The flexible membrane provides environmental sealing while the rigid label component provides mechanical and tactile feedback, simultaneously achieving both requirements.
2Adaptability or versatility
If the entire button portion is removed and replaced to change key markings, then adaptability is improved, but usability deteriorates if the button is lost
Solution Approach 1:
The key is segmented into a permanent button portion and a replaceable label component. Users can change markings by replacing only the label, not the entire button, maintaining usability while improving adaptability.
Solution Approach 2:
The label component is extracted as a separate replaceable element from the button. This allows users to remove and replace only the labeling portion to adapt to different applications while the button itself remains permanently attached and functional.
3Adaptability or versatility
If removable button components are used to change key markings, then adaptability is improved, but reliability deteriorates due to lack of locking mechanism
Solution Approach 1:
A locking mechanism is built into the label component design to prevent accidental removal. The locking feature engages automatically when the label is attached, providing preliminary protection against unintended detachment while still allowing intentional replacement.
Solution Approach 2:
A locking mechanism acts as an intermediary between the label component and the button, securing the label in place during normal use while allowing controlled removal when needed, thus balancing reliability and adaptability.
Data Source
AI summary
A key able to accept a label for a keypad used in controlling electrically operated devices, wherein the key structure accepts and secures an interchangeable label, and which forms an impermeable barrier to the electrical contacts of a programmable circuit board.