Electricity Meter Housing with Tool-Activated Unlocking
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Solution Overview
Problem
Existing electricity meters with snap-together housing parts are secure against tampering but difficult to reopen once closed, lacking a practical method to easily disassemble them for maintenance or access.
Innovation Solution
Incorporating unlocking openings in the housing that allow the locking elements to be shifted out of the latched position using a tool, with a cover that protects these openings to prevent unauthorized access, enabling the housing parts to be separated without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing parts are designed with snap-together locking elements for security, then tamper protection is improved, but the difficulty of reopening the housing increases
Solution Approach 1:
The housing locking mechanism is segmented into multiple independent locking elements (at least two locking protrusions and corresponding locking recesses) distributed around the housing perimeter. This segmentation allows the housing to be secured at multiple points simultaneously while providing multiple access points for unlocking, thereby maintaining strong tamper protection while enabling controlled reopening through the unlocking openings.
Solution Approach 2:
An intermediary unlocking tool is introduced that can be inserted through the unlocking openings to manipulate the locking elements. The tool acts as a mediator between the user and the locking mechanism, allowing authorized personnel to shift the locking protrusions out of their locked positions without damaging the housing. This intermediary mechanism resolves the contradiction by providing a controlled method to overcome the strong locking while maintaining security against unauthorized access.
2Reliability
If the locking elements are made secure and interlocked, then housing integrity is improved, but the ease of manufacture decreases
Solution Approach 1:
The locking protrusions and unlocking openings are merged into integrated features of the housing parts rather than being separate components. The locking elements are formed as part of the injection molding process for the housing, combining the structural housing with the locking mechanism. This merging maintains high housing integrity through robust interlocking while simplifying manufacture by eliminating separate locking components and reducing assembly steps.
Solution Approach 2:
The manufacturing process utilizes parameter changes in injection molding to create the locking features. By adjusting mold parameters and material flow during injection molding, the complex three-dimensional locking protrusions and recesses are formed directly in the plastic housing material. This approach maintains strong mechanical interlocking for housing integrity while avoiding the complexity of separate manufacturing processes for the locking elements.
3Reliability
If the housing is designed to be tightly closed for security, then protection against unauthorized access is improved, but the accessibility for maintenance decreases
Solution Approach 1:
The housing exhibits local quality differentiation: the majority of the housing surface maintains a sealed, secure configuration for tamper protection, while specific localized areas contain unlocking openings that provide controlled access. These openings are positioned at strategic locations where maintenance access is needed, allowing the housing to simultaneously achieve high overall security with targeted accessibility points for authorized maintenance operations.
Solution Approach 2:
The unlocking openings serve as intermediary access points that reconcile the contradiction between security and maintenance accessibility. When closed, these openings are imperceptible and maintain the housing's secure appearance. When maintenance is needed, an unlocking tool inserted through these openings can manipulate the locking elements, providing controlled access without compromising the overall security design. This intermediary mechanism allows the housing to remain tightly closed for security while enabling maintenance access when required.
Data Source
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AI summary
The meter has a lower housing part (10) including locking elements (24), and an upper housing part (12) including other locking elements such that the elements are engaged into each other during assembling the parts for providing a closed housing that is formed in an interior of one of the parts. The housing includes releasing openings by which the elements are accessible from outside when the housing is closed so that the elements are displaced in a non-engaging position. A cover (14) covers the openings in a closed position.