Sheet Metal Keypad Cover with Detachable Tabs for Tamper Resistance
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Solution Overview
Problem
Electronic locks, particularly those with keypads, face challenges in balancing security requirements with cost due to the use of expensive materials like die cast zinc for durability, necessitating a more affordable and secure design.
Innovation Solution
An electronic security keypad assembly made from sheet metal with a decorative cover and a mounting plate secured by fasteners, such as tabs or snaps, which is less expensive to manufacture and meets impact resistance standards by separating the cover from the mounting plate during vertical impact testing, maintaining the plate's integrity and preventing access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a keypad housing is made from highly impact-resistant material such as cast metal, then impact resistance and security are improved, but manufacturing cost increases
Solution Approach 1:
The keypad assembly is divided into separate components: a mounting plate that remains attached to the door and a cover that can detach during impact testing. This segmentation allows the use of less expensive materials for the cover while maintaining overall security through the permanent mounting plate attachment.
Solution Approach 2:
The cover is designed as a sacrificial component that may detach during impact events, protecting the more permanent mounting plate and internal electronics. This allows using cheaper materials for the cover while maintaining security through the durable mounting plate.
2Stability of the object's composition
If fasteners are used to secure the cover to the mounting plate, then assembly integrity is improved, but ease of disassembly for servicing deteriorates
Solution Approach 1:
The fastening system is designed to be dynamically responsive to impact forces, allowing the cover to detach under sufficient impact while maintaining secure attachment during normal operation. This dynamic behavior provides both stability during use and ease of replacement after impact events.
Solution Approach 2:
The cover is designed to be discarded (detached) during impact events to protect the mounting plate, but can be recovered and reattached afterward. This allows the assembly to maintain integrity during normal use while enabling easy servicing after impact events.
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 solution provides secure electronic access at a lower manufacturing cost than existing designs, ensuring durability and resistance to tampering while maintaining the mounting plate's integrity during impacts, thus reducing overall costs and enhancing security.
Implementation Method 1
bending each of the plurality of tabs into tab receiving regions of the back plate until each of the plurality of tabs is positioned in alignment with a rearward surface of the backplate
Data Source
AI summary
An electronic security keypad assembly includes a cover made of sheet metal, a keypad, and a mounting plate. Tabs extending the from the cover engage dented tab receiving regions of the mounting plate to secure the cover to the mounting plate. The tabs, when bent around the dented tab receiving regions, are obscured from access when mounted to a door, deterring physical tampering with the electronic keypad assembly.