Revolver Feed-Through with Conical Waveguides and Tamper-Proof Sealing
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Solution Overview
Problem
Existing revolver-type feed-throughs for TEMPEST-grade electromagnetic shielding do not provide adequate tamper-proof and weather-sealing functionalities, requiring additional security measures external to the feed-through, which can be costly and space-consuming.
Innovation Solution
A revolver-type feed-through design featuring a housing with a conical inner surface and a plug member with a conical outer surface, where the conical surfaces form waveguides upon attachment, with attachment mechanisms operable from one side to ensure tamper-proofing and incorporate a weather seal frame for sealing around signal leads, eliminating the need for external security measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional security measures external to the feed-through are used, then tamper-proofing and weather-sealing functionalities are provided, but space and cost increase
Solution Approach 1:
The patent integrates tamper-proofing and weather-sealing functionalities directly into the feed-through assembly by incorporating a seal frame with resilient sealing blocks and a weather seal. This merging of functions eliminates the need for separate external security measures, thereby reducing space and cost while maintaining reliability
Solution Approach 2:
The feed-through assembly is designed to perform multiple functions simultaneously: electromagnetic shielding, tamper-proofing, and weather-sealing. The seal frame and resilient sealing blocks provide both security and environmental protection, making the system multi-functional and eliminating the need for additional dedicated security components
2Ease of manufacture
If the housing has a circular cross-section, then manufacturing is easier, but the housing can rotate with respect to the wall, creating security vulnerabilities
Solution Approach 1:
The housing is designed with a non-circular cross-section that corresponds to the non-circular opening in the wall. This asymmetric shape prevents the housing from rotating once installed, as it can only be inserted in one specific orientation. The asymmetric design maintains manufacturing feasibility while providing inherent security against rotational tampering
3Reliability
If the attachment means are permanent, then security is improved, but flexibility of installation is reduced
Solution Approach 1:
The attachment means are designed to be removable and reattachable, transitioning between a secured state and an installable state. This dynamic capability allows the feed-through to be securely attached during operation for tamper-proofing, while also allowing for installation, removal, and repositioning when needed, thus providing both security and installation flexibility
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 design provides a tamper-proof and weather-sealed feed-through that reduces the need for external security measures, saving space and cost while ensuring effective electromagnetic shielding and protection against environmental factors.
Implementation Method 1
To achieve such attenuation characteristics, such a feed-throughs may comprise one or more waveguides operating below cut-off frequency
Implementation Method 2
a plurality of resilient sealing blocks adapted to be compressed between the upper part and the lower part of said weather seal, sealing around the one or more signal leads
Data Source
AI summary
A revolver-type feed-through for TEMPEST-grade electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure comprises a housing having a conical inner surface, the housing being attachable to the wall through a first attachment means; and a plug member having a conical outer surface matching the conical inner surface of the housing, the plug member being attachable to the housing through a second attachment means, wherein the conical inner surface of the housing and/or the conical outer surface of the plug member have recesses forming, when the plug member is attached to the housing, a plurality of waveguides. The first attachment means and the second attachment means being operable by one or more operating members located, with the feed-through in installed position, exclusively on one side of the wall, so that the first attachment means and the second attachment means are exclusively operable from the said one side of the wall.