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US006323419B1
(12) United States Patent ao) Patent No.: us 6,323,419 Bi
Toy (45) Date of Patent: Nov. 27,2001
(54) RFI SHIELDING ENCLOSURES AND THEIR CLOSURE SEALS
(76) Inventor: William W. Toy, 511 Andros La.,
Indian Harbour Beach, FL (US) 32937
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/707,154
(22) Filed: Nov. 6, 2000
(51) Int. C I. H05K 9/00
(52) U.S. CI 174/35 GC; 361/816;
174/35 R
(58) Field of Search 174/35 R, 35 MS,
174/35 GC; 361/816, 818; 277/920
(56) References Cited
U.S. PATENT DOCUMENTS
3,504,093 3/1970 Roberson 174/35
4,069,618 * 1/1978 Geiss 49/483
4,677,251 * 6/1987 Merewether 174/35 MS
4,760,214 * 7/1988 Bienia et al 174/35 GC
4,794,206 * 12/1988 Weinstein 174/35 MS
4,817,337 * 4/1989 Lahita 49/483
4,929,802 * 5/1990 Schaepers et al 174/35 MS
5,223,670 6/1993 Hogan 174/35 MS
An enclosure is shielded from electromagnetic radiation, especially for testing electronic equipment such as cellular telephones. An electrically conductive housing with a rectangular chamber has open top with a flange extending upward from its perimeter. An electrically conductive closure hinged to the housing has a peripheral groove holding a conductive spring finger assembly. When closed, the flange fits into the spring finger assembly, forcing the fingers apart and against the walls of the groove. This provides excellent conductive connection between the housing and the closure through the flange, the fingers, and the groove. The conductive spring finger assembly is machined from thin beryllium copper strip, formed to final shape into straight portions and corner portions with small radii and then heat treated to retain its final spring form.
17 Claims, 3 Drawing Sheets
