Tamper-Proof Enclosure Coupling Mechanism

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Solution Overview

Problem

Existing tamper-proof enclosures for process control devices in hazardous environments face challenges in maintaining explosion resistance and preventing unauthorized access, as secondary securing components can compromise the seal and standards compliance, and operators may inadvertently try to access components within these enclosures.

Innovation Solution

A tamper-proof control system comprising a housing and cap with a coupling mechanism that restricts relative rotation, utilizing a specialized application tool and securing tool to secure the cap to the housing without external fasteners, ensuring a proper seal and adherence to explosion-proof standards by using a groove and protrusion system and a high-pressure urging force to create a permanent interference fit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If secondary securing components such as set screws are used to prevent fastener loosening, then the enclosure security is improved, but the number of engaged threads in the fastener is reduced which may result in non-compliance with explosion-proof standards

Engineering Contradiction:

Improveenclosure securityVSAvoidengaged threads quantity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent removes traditional secondary securing components (set screws, lock washers) from the fastening system. Instead, it uses a specialized application tool that imparts a permanent deformation or interference fit during the initial installation, eliminating the need for additional securing elements while maintaining both security and standards compliance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The application tool acts as an intermediary device that facilitates the secure connection during installation. The tool imparts a permanent mechanical deformation or interference fit to the fastener or enclosure components, creating a tamper-proof connection without requiring secondary securing components that would reduce engaged thread quantity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the enclosure design resembles standard fasteners used in process control environments, then the ease of operation is improved, but operators may inadvertently attempt to gain access to components within the enclosure which compromises safety

Engineering Contradiction:

Improveenclosure accessibilityVSAvoidunauthorized access risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent employs asymmetric or non-standard fastening features that are visually and mechanically distinct from conventional process control fasteners. The specialized application tool and unique coupling mechanism create an appearance and operation mode that clearly indicates the enclosure should not be accessed, preventing inadvertent attempts at opening while maintaining ease of legitimate operation

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Instead of making the enclosure easily accessible like standard fasteners, the patent inverts the approach by designing a tamper-proof mechanism that appears sealed and secure. The fastening system is designed to look and feel permanently secured, with the application tool creating a visual indication that the enclosure is tamper-evident, thereby preventing unauthorized access attempts

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If traditional fastening methods with multiple components are used, then the ease of manufacture is improved, but the device complexity increases which may compromise the seal and standards compliance

Engineering Contradiction:

Improvefastening assemblyVSAvoidsecuring mechanism

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent merges the fastening function and sealing function into a single integrated mechanism. The application tool performs multiple operations simultaneously (securing the cap and ensuring proper seal engagement), eliminating the need for separate secondary securing components and reducing overall device complexity while maintaining manufacturing simplicity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The application tool is designed as a multi-functional device that performs both the fastening operation and the sealing verification in a single action. This universal tool eliminates the need for multiple specialized components (wrenches, set screw drivers, seal checkers), simplifying both the manufacturing process and the final device structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10701820B1Tamper proof approaches for securing an enclosure

Publication Date: 2020.06.30 FISHER CONTROLS INT LLC

AI summary

A tamper proof control system includes a housing, and a cap. The housing includes a housing body defining an interior volume to accommodate an electronic process control device and further includes a first end having a housing threaded portion. The cap includes a cap body that defines an interior volume and further includes a proximal end, a cap threaded portion, an exterior surface, and at least one groove formed on the exterior surface. The proximal end of the cap body defines a coupling portion. Upon threadably securing the cap to the housing, the coupling portion of the cap engages the housing threaded portion to restrict relative rotation between the housing and the cap.