Gasket for sealing electromagnetic waves

• US 5,079,388 A
• Filed: 08/17/1990
• Issued: 01/07/1992
• Est. Priority Date: 12/01/1989
• Status: Expired due to Fees

• Current Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Original Assignee: Joan C. Balsells, Peter J. Balsells
• Inventors: Balsells, Peter J.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Ledynh, Bot L.
• Application Number:
  US07/568,909
• Time in Patent Office: 508 Days
• Field of Search: 174/35 GC, 174/35 R, 174/35 MS, 361/424, 267/167, 219/10.55 D, 219/10.55 R, 277/227, 277/235 R, 277/235 B, 277/901
• US Class Current: 174/370
• CPC Class Codes: F16F 1/045 Canted-coil springs
• CPC Class Codes: F16J 15/0893 the packing having a hollow profile
• CPC Class Codes: H01R 13/6584 formed by conductive elastomeric members, e.g. flat gaskets or O-rings
• CPC Class Codes: H05K 9/0016 having a spring contact
• CPC Class Codes: Y10S 277/92 Seal including electromagnetic shielding feature

Abstract

An electromagnetic shielding gasket assembly includes a coil spring for blocking the propagation of electromagnetic waves therepast. The coil spring includes individal coils interconnected with one another and disposed in a canted relationship with a centerline of the coil spring and cause the coil spring to block the propagation of electromagnetic waves. The individual coils may be interconnected in a manner forming a continuous circular spring which may be disposed in a groove including a wedge-shaped portion for deflecting the individual coils and causing the individual coils to abutt at an inside diameter of the continuous circular spring.

Claims

1. Electromagnetic shielding gasket assembly comprising:

coil spring means for blocking the propagation of electromagnetic waves therepast, said coil spring means comprising a plurality of individual coils canted along a centerline thereof;

means for supporting the plurality of individual coils in an orientation for controlling the electromagnetic shielding effectiveness of the coil spring means; and

means, cooperating with said coil spring means, for loading the plurality of coils to control an aperture of the coil spring means through which electromagnetic waves can propagate.

2. The electromagnetic shielding gasket according to claim 1 wherein said individual coils are interconnected in a manner forming a continuous circular coil spring.

3. The electromagnetic shielding gasket according to claim 2 wherein said individual coils are fabricated from wire having a diameter, d, selected to achieve a desired shielding effectiveness, said shielding effectiveness increasing with increasing wire diameter.

4. The electromagnetic shielding gasket according to claim 3 wherein said individual coils are formed with a coil diameter, D, selected to achieve a desired shielding effectiveness, said shielding effectiveness decreasing with increasing D/d ratio.

5. The electromagnetic shielding gasket assembly according to claim 1 wherein said individual coils are interconnected in a manner forming a continuous circular coil spring having a turn angle greater than zero degree and said means for supporting the plurality of individual coils includes load and groove means for increasing the turn angle of the continuous circular coil spring to control an aperture of the circular coil spring through which electromagnetic waves may propagate thereby controlling the electromagnetic shielding effectiveness of the coil spring means.

6. The electromagnetic shielding gasket according to claim 5 wherein said individual coils are fabricated from wire having a diameter, d, selected to achieve a desired shielding effectiveness, said shielding effectiveness increasing with increasing wire diameter.

7. The electromagnetic shielding gasket according to claim 6 wherein said individual coils are formed with a coil diameter, D, selected to achieve a desired shielding effectiveness, said shielding effectiveness decreasing with increasing D/d ratio.

8. The electromagnetic shielding gasket according to claim 1 further comprising groove means for containing said coil spring means, and said means for supporting the plurality of individual coils includes means for causing said individual coils to abutt one another.

9. The electromagnetic shielding gasket assembly according to claim 8 wherein said individual coils are interconnected in a manner forming a continuous circular coil spring.

10. The electromagnetic shielding gasket assembly according to claim 9 wherein said individual coils are fabricated from wire having a diameter, d, selected to achieve a desired shielding effectiveness, said shielding effectiveness decreasing with increasing wire diameter.

11. The electromagnetic shielding gasket according to claim 10 wherein said individual coils are formed with a coil diameter, D, selected to achieve a desired shielding effectiveness, said shielding effectiveness increasing with increasing D/d ratio.

12. The electromagnetic shielding gasket assembly according to claim 9 wherein said means for causing said individual coils to abutt comprises a wedge.

13. The electromagnetic shielding gasket assembly according to claim 12 wherein said wedge is an integral part of said groove means.

14. The electromagnetic shielding gasket assembly according to claim 12 wherein said wedge is disposed within said groove means and is not fixed thereto.

15. The electromagnetic shielding gasket assembly according to claim 13 wherein said wedge is disposed within said groove means and includes means, defining an exterior shape thereof, for loading said individual coils along a minor axis thereof.

16. The electromagnetic shielding gasket assembly according to claim 14 wherein said wedge is disposed within said groove and including means, defining an exterior shape thereof, for loading said individual coils along a minor axis thereof.

17. The electromagnetic shielding gasket assembly according to claim 13 wherein said wedge is disposed within said groove means and includes means, defining an exterior shape, for causing said individual coils to abutt one another along an inside diameter of said continuous coil spring.

18. The electromagnetic shielding gasket assembly according to claim 1 further comprising groove means for containing said coil spring means, and said means for supporting the plurality of coils includes means for causing said individual coils to abutt one another without fatigue thereof and enabling repeated assembly and disassembly of parts, between which said electromagnetic shielding gasket assembly is disposed, without loss of electromagnetic shielding effectiveness due to such assembly and disassembly.

19. The electromagnetic shielding gasket assembly according to claim 18 wherein said individual coils are interconnected in a manner forming a continuous coil spring and said means for causing said individual coils to abutt comprises a wedge.

20. The electromagnetic shielding gasket assembly according to claim 19 wherein said wedge is an integral part of said groove means.

21. The electromagnetic shielding gasket assembly according to claim 19 wherein said wedge is disposed within said groove means and is not fixed thereto.

22. The electromagnetic shielding gasket assembly according to claim 21 wherein said individual coils are interconnected in a manner forming a continuous circular coil spring.

23. The electromagnetic shielding gasket assembly according to claim 22 wherein said individual coils are fabricated from wire having a diameter, d, selected to achieve a desired shielding effectiveness, said shielding effectiveness decreasing with increasing wire diameter.

24. The electromagnetic shielding gasket assembly according to claim 23 wherein said individual coils are formed with a coil diameter, D, selected to achieve a desired shielding effectiveness, said shielding effectiveness increasing with increasing D/d ratio.

25. The electromagnetic shielding gasket assembly according to claim 24 wherein said wedge is disposed within said groove means and including means, defining an exterior shape thereof, for loading said individual coils along a minor axis thereof.