Fracturable Retainer Locking System for Utility Meter Enclosures
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Solution Overview
Problem
Current locking devices for utility service enclosures, such as meter boxes, are costly, require special tools for operation, and can be easily defeated, lacking sufficient security and tamper-evidence, with some designs necessitating two hands for engagement or disengagement.
Innovation Solution
A tamper-evident locking system featuring an annular band with fracturable retainer and breaking tool, allowing secure connection and indication of tampering, where the fracturable retainer can be removed only with a special tool and is designed to fracture under specific force, rendering it ineffective after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional locking devices are used for utility service enclosures, then the locking mechanism can be operated multiple times, but the cost is high and they require special tools for operation
Solution Approach 1:
The locking device is divided into separate functional components: a locking member with gear teeth, a rotatable member with corresponding gear teeth, and a frangible member. This segmentation allows each component to perform its specific function independently, simplifying the overall operation while maintaining security.
Solution Approach 2:
The frangible member is designed as a single-use component that breaks after one operation. This disposable approach eliminates the need for complex reusable mechanisms with multiple moving parts, reducing both device complexity and operational requirements while providing sufficient security for the application.
2Reliability
If traditional locking devices are used, then they can be unlocked multiple times, but they lack sufficient tamper-evidence and can be easily defeated
Solution Approach 1:
The frangible member is pre-positioned to block the engagement between the locking member and rotatable member. This preliminary blocking action provides immediate tamper-evidence capability, as any attempt to access the enclosure without proper authorization will be evident from the broken frangible member.
Solution Approach 2:
The frangible member can incorporate visual indicators such as color changes or visible break patterns that clearly indicate whether the seal has been compromised. This provides immediate tamper-evidence without requiring complex electronic or mechanical detection systems.
3Ease of operation
If ring-type locking devices are used, then they can secure the enclosure, but they require two hands for engagement or disengagement and may require special tools
Solution Approach 1:
The locking mechanism is designed so that the locking member and rotatable member automatically engage through their interlocking gear teeth when the rotatable member is turned. This self-engaging mechanism eliminates the need for complex multi-step operations or special tools, enabling single-handed operation.
Solution Approach 2:
The complex mechanical engagement system is replaced with a simpler gear-tooth interlocking mechanism. The gear teeth on the locking member and rotatable member work together to provide secure engagement through rotational motion alone, eliminating the need for additional mechanical components or tools.
4Reliability
If frangible members are used to prevent unauthorized access, then tamper-evidence is provided, but the locking mechanism becomes more complex
Solution Approach 1:
The frangible member is integrated directly into the locking mechanism as an inherent component rather than a separate additive element. It is positioned to naturally block the engagement path between the locking member and rotatable member, providing tamper-evidence functionality without requiring additional complex structures.
Data Source
AI summary
The present invention relates to an apparatus and method for securing a box cover to a watthour meter socket box and relates to an apparatus, a system including a ring and fracturable locking system, in some embodiments, and method for securing a watthour electrical meter to a socket meter box. A locking sealing ring comprises an annular band, wherein a body portion of the annular band comprises a first band portion and a second band portion, and wherein the first band portion comprises a first ring end and the second band portion comprises a second ring end. A first tab is disposed on the first ring end and comprises a connector member. A second tab is disposed on the second ring end with the second tab comprising a receiver member, and wherein the connector member is adapted for connection with the receiver member. A fracturable retainer is provided comprising a body defining a passageway therethrough, wherein the passageway is configured to receive at least a portion of the first and second tabs, and wherein the fracturable retainer is adapted to inhibit access to at least the connector.