SE543811C2 - Feed-through for electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure - Google Patents
Feed-through for electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosureInfo
- Publication number
- SE543811C2 SE543811C2 SE1950558A SE1950558A SE543811C2 SE 543811 C2 SE543811 C2 SE 543811C2 SE 1950558 A SE1950558 A SE 1950558A SE 1950558 A SE1950558 A SE 1950558A SE 543811 C2 SE543811 C2 SE 543811C2
- Authority
- SE
- Sweden
- Prior art keywords
- housing
- feed
- attachment means
- plug member
- wall
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4248—Feed-through connections for the hermetical passage of fibres through a package wall
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/14—Shutters or guards for preventing access to contacts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0247—Electrical details of casings, e.g. terminals, passages for cables or wiring
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0018—Casings with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A revolver-type feed-through (2) for TEMPEST -grade electromagnetic shielding where one or more non-electric signal leads (18) pass through a wall (16) of a cabinet or other enclosure comprises a housing (4) having a conical inner surface (8), the housing being attachable to the wall through a first attachment means (10); and a plug member (6) having a conical outer surface (12) matching the conical inner surface (8) of the housing (4), the plug member (6) being attachable to the housing (4) through a second attachment means (14), wherein the conical inner surface (8) of the housing (4) and/or the conical outer surface (12) of the plug member have recesses (20) forming, when the plug member (6) is attached to the housing (4), a plurality of waveguides (22). The first attachment means (10) and the second attachment means (14) being operable by one or more operating members (24, 26) located, with the feed-through in installed position, exclusively on one side of the wall (16), so that the first attachment means (10) and the second attachment means (14) are exclusively operable from the said one side of the wall (16).
Description
FEED-THROUGH FOR ELECTROMAGNETIC SHIELDING WHERE ONEOR MORE NON-ELECTRIC SIGNAL LEADS PASS THROUGH A WALL OFA CABINET OR OTHER ENCLOSURE Field of the invention The present inventive concept relates to a revolver-type feed-throughfor TEMPEST-grade electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure.
BackgroundSuch a feed-through can be used to prevent emission of electromagnetic waves, for example to avoid electromagnetic interference orthe leakage of critical information from electronic equipment, such as anetwork switch or server, placed in a cabinet or enclosure. For thisapplication, standards, usually referred to using the term “TEIVIPEST”, areestablished that require attenuation up to the order of 100 dB at frequenciesup to 10 GHz at the feed-through.
To achieve such attenuation characteristics, such a feed-throughs maycomprise one or more waveguides operating below cut-off frequency.
Revolver-type feed-throughs, wherein a plurality of waveguides aredistributed around the interface between a housing and a plug memberpushable into the housing, are known in the prior art. Examples of suchfeedthroughs are disclosed in documents US4849723 andUS20170090120A1 _ There is always a need to improve such feed-throughs.
SummaryAccording to the present inventive concept, and, according to a first aspect, there is provided a revolver-type feed-through for TEMPEST-gradeelectromagnetic shielding where one or more non-electric signal leads passthrough a wall of a cabinet or other enclosure, comprising a housing having aconical inner surface, the housing being attachable to the wall through a first attachment means; and a plug member having a conical outer surfacematching the conical inner surface of the housing, the plug member beingattachable to the housing through a second attachment means, wherein theconical inner surface of the housing and/or the conical outer surface of theplug member have recesses forming, when the plug member is attached tothe housing, a plurality of waveguides. Each of the first attachment meansand the second attachment means are operable by one or more operatingmembers located, with the feed-through in installed position, exclusively onone side of the wall, so that the first attachment means and the secondattachment means are exclusively operable from that one side of the wall.
The second attachment means comprises a transversal slot throughthe plug member; a pair of openings in the housing, matching the transversalslot; and a locking rod provided with a convex surface, wherein the lockingrod, with the plug member attached to the housing, extends through thetransversal slot and the pair of openings and at a first end is pivoted at a pivotpoint fixed in position with respect to the housing and at a second end ispushed so that the convex surface abuts against an inner surface of thetransversal slot, pushing the plug member in a direction into the housing.
This provides a mechanism that is easier to install, yet secure, if spacebehind the feed-through, usually on the inside of the cabinet or enclosure, istight. Further, the locking rod provides a lever arm which simplifies removal ofthe second attachment means.
Typically, the said one side of the wall is the inside of the cabinet ofenclosure. ln this way, a tamper- and breakin-proof feed-through is provided.Using such a feed-through eliminates or mitigates the need for additionalsecurity measures external to the feed-through, saving space and cost.
Preferably, the first attachment means and the second attachmentmeans are removable. This allows for flexibility of installation.
A recess of the conical outer surface may have a slot for a cover,wherein, with the plug member attached to the housing and the coverinstalled in the slot, the housing covers the slot, preventing the cover frombeing removed from the slot. ln typical use, a waveguide will be covered by aslot if it is unused, i.e., no signal passes through it. This provides additional security and tamper-proofing, since it eliminates the possibility of tamperingwith the operating members through the waveguides.
The housing may have a non-circular cross-section, which, with thehousing in installed position at the wall, may fit into a corresponding non-circular opening in the wall, preventing the housing from rotating with respectto the wall. Alternatively, or additionally, the one or more operating means ofthe first attachment means may be operable without rotating the housing. Thisprovides additional security and tamper-proofing, since it eliminates thepossibility of tampering with or loosening the housing from the wall by rotatingit.
The first attachment means may comprise an outer thread on thehousing and a nut, comprising the operating member, having an inner threadmatching the outer thread of the housing. This provides a simple yet securemechanism for attaching the housing to the wall.
The locking rod may have a second convex surface, opposite theconvex surface, where, during removal of the second attachment means, thesecond convex surface abuts a second inner surface of the transversal slot.This aids removal of the second attachment means using the locking rod as alever arm.
The pivot point and the pushing may be provided by a framearrangement mountable around the housing. The frame, in installed position,may abut against a shoulder of the housing.
The feed-through may further comprise a weather seal frame,comprising an upper part and a lower part adapted to fit around the housing;and a plurality of resilient sealing blocks adapted to be compressed betweenthe upper part and the lower part of said weather seal, sealing around the oneor more signal leads. Advantages and embodiments are identical to thosedescribed below in conjunction with the sixth aspect.
The plurality of waveguides may comprise four waveguides arranged ina rectangular pattern. This allows the waveguides to line up with the resilientblocks of the weather seal, allowing such a seal to be used together with therevolver-type feed-through.
The said plug member may comprise a transversally extending pinmatching a transversal slot in the housing. During insertion of the plugmember into the housing, the slots will rotationally guide the plug member.Further, with the plug member inserted into and attached to the housing, theslot and pin will prevent the plug member from rotating with respect to thehousing. This provides a simple and robust mechanism that simplifiesinstallation, as the plug member is ensured to always have the correctrotational configuration with respect to the housing.
According to a second aspect, there is provided a system, comprisingthe feed-through according to the first aspect, one or more of signal leads,and a cabinet or enclosure.
Advantages and embodiments of this second aspect are at least thesame as and/or compatible with those described above in conjunction withthe first aspect.
According to a third aspect, there is provided kit comprising a feed-through according to the first aspect, wherein a threaded bore is located inthe plug member and has an opening located, with the feed-through ininstalled position, on the said one side of the wall; and an alternative secondattachment means comprising a bolt provided with an outer thread; and anelongated crossbar; wherein the threaded bore matches the outer thread ofthe bolt, the bolt, with the plug member attached to the housing with thealternative second attachment means, pulls against the plug member throughthe threaded bore and pushes against the housing through the crossbar, andone of the second attachment means and the alternative second attachmentmeans is selectable during installation of the feed-through.
Thus, the components of the second attachment means and thealternative second attachment means may be provided as a kit. Thealternative actually used at the point of installation may then be selectedduring installation ofthe feed-through, increasing flexibility.
The alternative second attachment means provides a simple yetreliable mechanism for attaching the plug member to the housing. Using an elongated crossbar, which may fit into a pair of slots on the housing, insteadof a more elaborate plate structure which must have large recesses matchingthe waveguides, simplifies manufacturing while still providing a secondattachment means with higher strength and reliability that also is easier toinstall.
According to a fourth aspect, there is provided a method of installing arevolver-type feed-through for TEMPEST-grade electromagnetic shieldingthrough a wall of a cabinet or other enclosure, comprising: attaching ahousing to the wall through a first attachment means, the housing having aconical inner surface; pulling one or more non-electric signal leads throughthe housing; attaching a plug member to the housing, an outer conical surfaceof said plug member matching the conical inner surface of the housing, theconical inner surface and/or the conical outer surface having recessesforming a plurality of waveguides enclosing said one or more signal leads;said first attachment means and said second attachment means beingexclusively operated from one side of said wall, wherein the secondattachment means comprises a transversal slot through the plug member; apair of openings in the housing, matching the transversal slot; and a lockingrod provided with a convex surface, wherein the locking rod, with the plugmember attached to the housing, extends through the transversal slot and thepair of openings and at a first end is pivoted at a pivot point fixed in positionwith respect to the housing and at a second end is pushed so that the convexsurface abuts against an inner surface of the transversal slot, pushing theplug member in a direction into the housing.
Advantages and embodiments of this fourth aspect are at least thesame as and/or compatible with those described above in conjunction withthe first aspect.
The feed-through may further comprise a weather seal framecomprising an upper part and a lower part adapted to fit around and sealagainst the housing; and 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.
With weather sea| should be understood a sea| sealing against one ormore of, but not limited to, weather, moist, dirt, oil, splashing water, whichmay be fresh or salt water, or similar.
This allows weather sealing to be provided directly by the feed-through,eliminating the need for additional measures to provide weather sealing, forexample the need to place the cabinet or enclosure in a weather-sealedroom. This saves space. This, for example, is useful in marine applications.
The upper part and the lower part may be identical in design, whichsimplifies manufacturing and installation.
The feed-through may be used in combination with a weather sea|comprising a weather sea| frame comprising an upper part and a lower partadapted to fit around and sea| against the housing; and a plurality of resilientsealing blocks adapted to be compressed between the upper part and thelower part of the weather sea| frame, sealing around the one or more signalleads.
Advantages and embodiments of this use are at least the same asand/or compatible with those described above. Advantages and embodimentsdescribed above in conjunction with the first aspect are compatible with thisuse.
Brief description of the drawinqs The above, as well as additional objects, features and advantages ofthe present inventive concept, will be better understood through the followingillustrative and non-limiting detailed description of preferred embodiments,with reference to the appended drawings, where the same referencenumerals will be used for similar elements, wherein: Figs 1a and 1b are exploded views, from two different respectiveangles, of a revolver-type feedthrough; Figs 2a, 2b; 3; 4, and 5a, 5b, 5c, 5d show a typical assembly sequenceof the feed-through, wherein Figs 2a, 2b; 3; 4; and 5a, 5b are perspectiveviews and 5c, 5d are cross-sectional views; Figs 6; 7; 8; 9a, 9b; and 10 show a typical assembly sequence of analternative second attachment means of the feed-through, wherein Figs 6; 7;8; 9a are perspective views and Figs 9b and 10 are cross-sectional views; Fig. 11 is a cross-sectional view showing removal of the alternativesecond attachment means.
Figs 12, 13, 14, 15, and 16 are perspective views showing assembly ofan optional weather seal for use with the feedthrough; Fig. 17 schematically illustrates a protected cabinet or other enclosure;and Fig. 18 schematically illustrates a waveguide operating below-cutofffrequency.
Detailed descriptionFig. 17 illustrates a protected cabinet or other enclosure 201, which is a context where a feed-through 2 (cf. Figs 1a and 1b) according to thepresent disclosure can be used. Such a cabinet or other enclosure can beused in a sensitive environment where processing devices 203 in the cabinet201, such as servers, electronically process unencrypted or encryptedsensitive information. The cabinet 201, made from an electrically contuctivematerial, which may be thick sheet metal, functions as a Faraday cage,containing within its enclosure any electromagnetic radiation from theprocessing devices 203, thereby preventing the leakage of sensitiveinformation. The processing devices 203 communicate with nodes 213outside the cabinet 201 via non-electric signal leads 205, such as opticalfibers, which are terminated by means of connectors 207, 209 at each if theirends. The signal-leads must be non-electric in order not to spoil thefunctioning of the shielding, as an electric signal lead would act as anantenna, spoiling the shielding of the inside of the cabinet or enclosure. Thesignal leads may convey less sensitive information or the information carriedby them may be encrypted. Furthermore, the conveyed optical signals as such usually give negligible Ieaked radiation, preventing interception of suchsignals, unless the fibers are tampered with.
The feed-through where the optical fibers extend out of the cabinet 201requires special attention so that electromagnetic radiation does not escapethe cabinet, risking interception by a third party nearby. ln addition to the shielding situation described above, the feed-throughmay be useful in other situations where considerable attenuation at aconnection into a Faraday cage is needed. For instance, as the effectprovided is more or less reciprocal, the feed-through could protect sensitiveequipment in a cabinet from external electromagnetic interference, such aselectromagnetic pulses with high energy. Further, a shielded room used forsensitive measurements could be protected from external electromagneticinterference, etc.
Additionally, the cabinet or enclosure 201 may be subject torequirements of weather proofing and/or tamper proofing and/or securityagainst break-in. Normally such feed-throughs do not provide suchfunctionality by themselves, requiring such functionality to be providedexternal to the cabinet or enclosure 201, for example by the cabinet orenclosure being located in a secured and/or weather sealed room. With thepresent inventive concept, such functionality may be provided directly by thefeed-through itself. This is particularly advantageous in environments wherespace is at a premium.
As is well known per se, an attenuating feed-through can be obtainedby means of a waveguide below-cutoff, WBCO, of which one example isschematically illustrated in Fig 16. ln this example the waveguide 212, madefrom a conductive material, has a cavity 214, open at both ends, with acircular cross section with diameter D and a length l. The waveguide extendsthrough a wall in a Faraday cage 201.
Electromagnetic waves can propagate through a waveguide in anumber of different modes, corresponding to different solutions to the Maxwellequations. These modes are distinguished by different configurations of theelectric and magnetic fields. Each of these modes has a cut-off frequency,below which no substantial propagation in that mode is possible. Below the lowest cut-off frequency of all possible modes, no substantial propagation ofelectromagnetic waves is possible at all. lnstead, signals suffer exponentialattenuation. For example, in a circular waveguide, the mode with the lowestcut-off frequency is the TE11 (transverse electric) mode. The cut-off frequencyfc of that mode can be shown to be, to three significant figures, Û.586 17c I D 1 where v is the propagation speed of the waveguide dielectric, i.e., thenon-conductive material forming the bulk of the waveguide cavity. ln air, v isto a good approximation 3 >< 108 m/s. Below this cut-off frequency, over adistance l, an electromagnetic wave with frequency f suffers a totalattenuation of again to three significant figures, 2 A=32.0% 1-
Claims (13)
1. A revolver-type feed-through (2) for TEMPEST-grade electromagneticshielding where one or more non-electric signal leads (18) pass through awall (16) of a cabinet or other enclosure, comprising: a housing (4) having a conical inner surface (8), said housingbeing attachabie to said wall through a first attachment means (10); and a plug member (6) having a conical outer surface (12) matchingsaid conical inner surface (8) of said housing (4), said plug member (6) beingattachabie to said housing (4) through a second attachment means (14), wherein said conical inner surface (8) of said housing (4) and/or said conical outer surface (12) of said plug member have recesses (20) forming,when said plug member (6) is attached to said housing (4), a plurality ofwaveguides (22), said feed-through (2) being characterized by each of saidfirst attachment means (10) and said second attachment means (14) beingoperable by one or more operating members (24, 26) located, with said feed-through in installed position, exclusively on one side of said wall (16), so thatsaid first attachment means (10) and said second attachment means (14) areexclusively operable from said one side of said wall (16), wherein said secondattachment means (14) comprises: a transversal slot (48) through said plug member (6); a pair of openings (50) in said housing (4), matching saidtransversal slot (48); and a locking rod (52) provided with a convex surface (54),wherein said locking rod (52), with said plug member (6) attached to saidhousing (4), extends through said transversal slot (48) and said pair ofopenings (50) and at a first end pivoted at a pivot point (56) fixed in positionwith respect to said housing (4) and at a second end is pushable so that saidconvex surface abuts against an inner surface of said transversal slot (48),pushing said plug member (6) in a direction into said housing (6). 19
2. The feed-through (2) of claim 1, wherein a said recess (20) of saidconical outer surface (12) has a slot (28) for a cover (30), wherein, with saidplug member (12) attached to said housing (4) and said cover (30) installed insaid slot (28), said housing (4) covers said slot (28), preventing said cover (30) from being removed from said slot (28).
3. The feed-through (2) of any one of claims 1-2, wherein said housing (4) has a non-circular cross-section, which, with said housing ininstalled position at said wall, may fit into a corresponding non-circularopening (32) in said wall (16), preventing said housing (4) from rotating withrespect to said wall.
4. The feed-through of any one of claims 1-3, wherein said one or moreoperating means (24) of said first attachment means (10) is operable withoutrotating said housing (4).
5. The feed-through (2) of any one of claims 1-4, wherein said firstattachment means (10) comprises an outer thread (34) on said housing (4)and a nut (24), acting as said operating member (24), having an innerthread (36) matching said outer thread (34) of said housing (4).
6. The feed-through (2) of any one of the preceding claims, wherein saidpivot point (56) and said pushing is provided by a frame arrangement (58)mountable around said housing (4).
7. The feed-through (2) of claim 6, wherein said frame arrangement (58),in installed position, abuts against a shoulder (65) of said housing (4).
8. The feed-through (2) of any one of the preceding claims, wherein saidplug member (6) a transversally extending pin (68), matching a transversalslot (70) in said housing (4).
9. The feed-through (2) of any one of the preceding claims, furthercomprising: a weather seal frame (106) comprising an upper part (106b) anda lower part (106a) adapted to fit around said housing; and a plurality of resilient sealing blocks (104) adapted to becompressed between said upper part (106b) and said lower part (106a) ofsaid weather seal frame (106), sealing around said one or more signalleads (18).
10.plurality of waveguides comprises four waveguides (22) arranged in a The feed-through (2) of any one of the preceding claims, wherein said rectangular pattern.
11. A system, comprising the feed-through (2) of any one of the precedingclaims, one or more said signal leads, and said cabinet (18) or enclosure.
12. A kit, comprising: the feed-through (2) of any one of claims 1-10, wherein athreaded bore (42) is located in said plug member and has an openinglocated, with said feed-through (2) in installed position, on said one side ofsaid wall (16); and an alternative second attachment means (14) comprising: a bolt (38) provided with an outer thread (40); andan elongated crossbar (46),wherein:said threaded bore (42) matches said outer thread (40) of saidbolt (38);said bolt (38), with said plug member (6) attached to said housing (4)with said alternative second attachment means, pulls against said plugmember (6) through said threaded bore (42) and pushes against saidhousing (4) through said crossbar (46); andone of said second attachment means (14) and said alternative second attachment means (14) is selectable during installation of said feed-through (2). 21
13. A method of installing a revolver-type feed-through (2) for TEMPEST-grade electromagnetic shielding through a wall (16) of a cabinet or otherenclosure, comprising: attaching a housing (4) to said wall (16) through a firstattachment means (10), said housing (4) having a conical inner surface (8); pulling one or more non-electric signal leads (18) through saidhousing (4); attaching a plug member (6) to said housing (4) through asecond attachment means, an outer conical surface (12) of said plugmember (6) matching said conical inner surface (8) of said housing (4), saidconical inner surface (8) and/or said conical outer surface (12) havingrecesses forming a plurality of waveguides (22) enclosing said one or moresignal leads (18); said method being characterized by said first attachment means (10) and said second attachment (14) means being exclusively operated from one side of said wall (16), wherein said second attachment means (14) comprises: a transversal slot (48) through said plug member (6); a pair of openings (50) in said housing (4), matching saidtransversal slot (48); and a locking rod (52) provided with a convex surface (54),wherein said locking rod (52), with said plug member (6) attached to saidhousing (4), extends through said transversal slot (48) and said pair ofopenings (50) and at a first end pivoted at a pivot point (56) fixed in positionwith respect to said housing (4) and at a second end is pushed so that saidconvex surface abuts against an inner surface of said transversal slot (48),pushing said plug member (6) in a direction into said housing (6).
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1950558A SE543811C2 (en) | 2019-05-09 | 2019-05-09 | Feed-through for electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure |
| US17/609,840 US20220221660A1 (en) | 2019-05-09 | 2020-05-07 | Feed-through |
| EP20727402.8A EP3967117B1 (en) | 2019-05-09 | 2020-05-07 | Feed-through |
| PCT/SE2020/050471 WO2020226564A1 (en) | 2019-05-09 | 2020-05-07 | Feed-through |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1950558A SE543811C2 (en) | 2019-05-09 | 2019-05-09 | Feed-through for electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1950558A1 SE1950558A1 (en) | 2020-11-10 |
| SE543811C2 true SE543811C2 (en) | 2021-07-27 |
Family
ID=73649972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1950558A SE543811C2 (en) | 2019-05-09 | 2019-05-09 | Feed-through for electromagnetic shielding where one or more non-electric signal leads pass through a wall of a cabinet or other enclosure |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE543811C2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE544952C2 (en) * | 2021-06-30 | 2023-02-07 | Roxtec Ab | Transition for optical fibre cable |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4008948A (en) * | 1975-06-30 | 1977-02-22 | Northern Telecom Limited | Optical fibre connectors |
| US4849723A (en) * | 1988-05-25 | 1989-07-18 | Oliver Jr Harry S | Waveguide filter |
| US5426715A (en) * | 1993-07-23 | 1995-06-20 | Raychem Corporation | Oval port seal and method used for an optical fiber cable closure |
| DE102010031345A1 (en) * | 2009-07-17 | 2011-01-20 | Wiska Hoppmann & Mulsow Gmbh | Tamper-proof cable entry |
| WO2013076054A2 (en) * | 2011-11-22 | 2013-05-30 | Tyco Electronics Raychem Bvba | System and method for mounting blown fiber tubes to a housing |
| US20170090120A1 (en) * | 2015-09-29 | 2017-03-30 | Fiberplex Technologies, LLC | Waveguide filter |
| US20180145492A1 (en) * | 2015-05-06 | 2018-05-24 | Eaton Protection Systems Ip Gmbh & Co. Kg | Cable/lead insertion unit |
| US20180145493A1 (en) * | 2016-11-21 | 2018-05-24 | Icotek Project Gmbh & Co. Kg | Device for the insertion of a wire in a room |
-
2019
- 2019-05-09 SE SE1950558A patent/SE543811C2/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4008948A (en) * | 1975-06-30 | 1977-02-22 | Northern Telecom Limited | Optical fibre connectors |
| US4849723A (en) * | 1988-05-25 | 1989-07-18 | Oliver Jr Harry S | Waveguide filter |
| US5426715A (en) * | 1993-07-23 | 1995-06-20 | Raychem Corporation | Oval port seal and method used for an optical fiber cable closure |
| DE102010031345A1 (en) * | 2009-07-17 | 2011-01-20 | Wiska Hoppmann & Mulsow Gmbh | Tamper-proof cable entry |
| WO2013076054A2 (en) * | 2011-11-22 | 2013-05-30 | Tyco Electronics Raychem Bvba | System and method for mounting blown fiber tubes to a housing |
| US20180145492A1 (en) * | 2015-05-06 | 2018-05-24 | Eaton Protection Systems Ip Gmbh & Co. Kg | Cable/lead insertion unit |
| US20170090120A1 (en) * | 2015-09-29 | 2017-03-30 | Fiberplex Technologies, LLC | Waveguide filter |
| US20180145493A1 (en) * | 2016-11-21 | 2018-05-24 | Icotek Project Gmbh & Co. Kg | Device for the insertion of a wire in a room |
Also Published As
| Publication number | Publication date |
|---|---|
| SE1950558A1 (en) | 2020-11-10 |
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