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Publication numberUS1765443 A
Publication typeGrant
Publication dateJun 24, 1930
Filing dateFeb 25, 1928
Priority dateFeb 25, 1928
Publication numberUS 1765443 A, US 1765443A, US-A-1765443, US1765443 A, US1765443A
InventorsOlaf Peterson Harold
Original AssigneeRca Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shielding
US 1765443 A
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Description  (OCR text may contain errors)

June 24, 1930. H. o. ETERSON 1,765,443

SHIELDING Filed Feb. 25, 1928 INVENTOR mom 0. PETERSON BY j Adm ATT RNEY Patented June 24, 1930 UNITED STATES PATENT OFFICE HAROLD OLAF PETERSON, OF RIVERHEAD, NEW YORK, ASSIGNOR TO RADIO CORPO- RA'JJION OF AMERICA, A CORPORATION OF DELAWARE SHIELDING Application filed February 25, 1928. Serial No. 257,088.

This invention relates to shielding, and more particularly to metallic shielding employed with alternating current apparatus to prevent undesired magnetic and electric coupling.

Frequently alternating current apparatus must beshielded, either to prevent it from radiating energy, or, in the case of sensitive apparatus, to protect it from the influence of interfering energy. For this purpose it is customary to surround the apparatus to be shielded in a metallic enclosure. If the shielded apparatus is to be accessible it is necessary to provide one of the shielding plates with an opening, or to make the enclosure with an. open side, and to cover the opening or side with a removable conductive plate.

The latter may be completely detachable, or

hinged, or pivoted, and I intend the term removable to comprehend all equivalent arrangements.

I find that the resulting break in the continuity of the shielding destroys its effective ness unless intimate conductive contact is made between the two plates, and to provide such contact is an object of my invention. For this purpose I insert resilient conductive means between ,the plates at the rim of the opening.

I prefer to make the resilient means in the form of-a conductive flange of springy material,and I fix this flange to one of the plates. In order not to lessen-the accessibility of the enclosed apparatus I prefer to attach the flange to the removable cover, so' that it is entirely out of the way when the cover is removed.

It is essential that good electrical contact be made all around the periphery of the cover, and even with a resilient flange this result often is not attained, owing to irregularities in the surfaces brought into contact. To make a more perfect electrical union, even between surfaces which are not perfectly plane, is a 45 further object of my invention, which I fulfill by transversely slotting the resilient conductive flange all around its edge in order to form a plurality of independently yieldable flange portions.

The in enti n is described more in d a l in the following specification, which is accompanied by a drawing in which Figure 1 is a detail of a preferred form of flange;

Figure 2 is a View of the inside of a cover plate provided with a slotted flange; and

Figure 3 illustrates a metallic enclosure assembled with its removable cover.

Referring to Figure 1 there is a metallic enclosure 2, provided with an opening bounded by the edge 4. For closing the opening there is a cover plate 6, and between the plates 2 and 6 there Is provided a resilient conductlve flange 8, which is fixed on the cover plate 6 by means of a frame 10 attached to the cover plate by means of screws 12.

Referring to Figure 2 the cover plate 6 is seen to be, in this case, rectangular, and provided adjacent its periphery with a flange 8,

fixed to the plate 6 by means of the frame 10, which is screwed to the plate 6 by means ofscrews 12. It will be seen in this case that the flange 8 has been provided with a number of slots 14, so that it is made up, in effect, of a plurality of independently yieldable flange portions, thereby making possible more perfect electrical contact all around the rim of the cover.

Figure 3 shows a complete metallic container 2 provided with a removable cover plate 6. The container may enclose any alternating current apparatus which is to be shielded, whether to prevent radiation, or to insulate from reception, through either magnetic or capacitive coupling. The cover 6,.

2. The combination With a' conductive shielding plate having an opening, and a re movable conductive shielding plate for coverings'aid opening, of a resilient conductive flange fixed to one of said plates in proper position to be between the plates and adjacent the rim of the openin when the plates are brought together, in order to insure good electrical contact therebetween.

3. The combination with a conductive shielding plate having an opening, and a removable conductive shielding plate for covering said opening, of a resilient conductive flange, transversely slotted to form a plurality of independently yieldable flange portions, fixed to one of said plates in proper position to be between the plates and adjacent the rim of the opening when the plates are brought together, in order to insure good electrical contact therebetween.

4. In combination, alternating current aparatus to be shielded, a metallic enclosure or shielding said apparatus having an opening for access thereto, a removable metallic cover for said opening and resilient conductive means situated tween the cover and enclosure adjacent the periphery of the cover for insuring good electrical contact between the cover and enclosure. I

5. In combination, alternating current apparatus to be shielded, a metallic enclosure for shielding said apparatus having an opening for access thereto, a removable metallic cover for said opening, and a resilient conductive flange fixed to the cover adjacent its periphery for insuring good electrical contact between the cover and enclosure.

6. In combination, alternating current apparatus to be shielded, a metallic enclosure for shielding apparatus having an opening for access thereto, a removable metallic cover for said opening, and a resilient conductive flange, transversely slotted to form a plurality of independently yieldable flange portions, fixed to the cover adjacent its periphery for insuring (good electrical contact between the cover an enclosure.

HAROLD OLAF PETERSON.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2572157 *Dec 31, 1947Oct 23, 1951Air King Products Co IncCombination radio-wire recorder
US2604507 *Aug 9, 1945Jul 22, 1952Bendix Aviat CorpShielding closure means
US2722599 *Apr 28, 1951Nov 1, 1955Avco Mfg CorpMulti-element radiation shield
US3128139 *Jun 27, 1960Apr 7, 1964Hallett Mfg CompanySpark plug shield
US3755612 *Mar 6, 1972Aug 28, 1973Litton Systems IncStructural supports providing shielding against interference
US3962550 *Jul 12, 1973Jun 8, 1976Siemens AktiengesellschaftJoint seals for electromagnetic wave shields
US4039741 *Feb 18, 1976Aug 2, 1977Rockwell International CorporationGasket apparatus
US4056682 *Feb 18, 1976Nov 1, 1977Rockwell International CorporationGasket apparatus
US4384165 *Sep 14, 1981May 17, 1983Motorola, Inc.Radio frequency shield with force multiplier interconnection fingers for an electromagnetic gasket
US4807891 *Jul 6, 1987Feb 28, 1989The United States Of America As Represented By The Secretary Of The Air ForceElectromagnetic pulse rotary seal
US4873395 *Nov 14, 1988Oct 10, 1989Compuadd CorporationPersonal computer expansion slot seal and method
US5004867 *May 25, 1989Apr 2, 1991Compuadd CorporationPersonal computer expansion slot seal and method
US5032689 *Aug 15, 1989Jul 16, 1991Halligan Brian SEMI/RFI shielding vent and method of use
US5095177 *Sep 20, 1990Mar 10, 1992Technophone LimitedRf sealed radio housing
US5164543 *Jun 28, 1991Nov 17, 1992Digital Equipment CorporationApparatus for connecting and shielding enclosures housing electronic equipment
US5204496 *Apr 1, 1992Apr 20, 1993Digital Equipment CorporationEMI shielding gasket
US5231246 *Jul 14, 1992Jul 27, 1993Digital Equipment CorporationApparatus for securing shielding or the like
US5262923 *Jun 21, 1991Nov 16, 1993Tandon CorporationRailing with grounding tabs for grounding and mounting computer components in a computer
US5311408 *Apr 29, 1993May 10, 1994Tandem Computers, IncorporatedElectronic assembly with improved grounding and EMI shielding
US6607308Aug 22, 2001Aug 19, 2003E20 Communications, Inc.Fiber-optic modules with shielded housing/covers having mixed finger types
US6659655Feb 12, 2001Dec 9, 2003E20 Communications, Inc.Fiber-optic modules with housing/shielding
US6874953Jul 11, 2003Apr 5, 2005Jds Uniphase CorporationMethods and apparatus for fiber-optic modules with shielded housings/covers with fingers
US7078614Feb 11, 2005Jul 18, 2006Laird Technologies, Inc.Shielding strips
US7112740Jul 5, 2005Sep 26, 2006Laird Technologies, Inc.Shielding strips
US8203850Feb 5, 2008Jun 19, 2012Vector Technologies, LlcAnti-eavesdropping device
US8665607May 23, 2012Mar 4, 2014Vector Technologies, LlcAnti-eavesdropping device
DE2931382A1 *Aug 2, 1979Feb 26, 1981Bosch Gmbh RobertKurzschlussring-geber
EP1100301A1 *Nov 11, 1999May 16, 2001Kathrein-Werke KGHigh frequency shielding
WO1983001174A1 *Aug 30, 1982Mar 31, 1983Motorola IncRadio frequency shield with force multiplier interconnection fingers for an electromagnetic gasket
Classifications
U.S. Classification174/366, 455/347, 455/300, 123/633
International ClassificationH05K9/00, H05B6/76
Cooperative ClassificationH05K9/0016, H05B6/76
European ClassificationH05K9/00B2B, H05B6/76