Device for sealing electromagnetic waves

• US 5,072,070 A
• Filed: 12/01/1989
• Issued: 12/10/1991
• 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:
  US07/444,287
• Time in Patent Office: 739 Days
• Field of Search: 174/35 GC, 174/35 R, 174/35 MS, 361/424, 219/10.55 R, 219/10.55 D, 277/227, 277/235 R, 277/235 B, 277/901, 267/167, 267/168
• 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

Abstract

A resilient electromagnetic shielding gasket utilizes a plurality of conductive wire coils which are loaded in a manner so that coil spacing may be selectively adjusted at specific areas along the circumference thereof in order to provide an electromagnetic shield. Other portions along the circumference of the gasket provide sufficient biasing capability to take up for variations that may occur due to torquing, eccentricities, irregularities and other variables and thereby imminent contact between mating surfaces under load. The spacing along a seal-load portion of the gasket is selected to limit the passage of electromagnetic energy with a wavelength greater than a selected value.

Claims

1. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof;

means for preloading said plurality of coils in a manner causing coil spacing along the circumference of adjoining coils to be less along a seal-load portion thereof than along other coil portions on the circumference of adjoining coils, said coil spacing along the seal-load portion being selected to limit the passage of electromagnetic energy with a wavelength greater than a selected value.

2. The resilient electromagnetic shielding device according to claim 1 further comprising back angle means for both defining the disposition of a trailing portion of each coil with respect to a line normal to the centerline and for determining the working resilient range of the gasket and front angle means for defining the disposition of a leading portion of each coil with respect to the normal line, said front angle means being greater than said back angle means.

3. The resilient electromagnetic shielding device according to claim 2 wherein the back angle means defines a working resilient range wherein the gasket exerts a generally constant force in response to deflection of the gasket.

4. The resilient electromagnetic shielding device according to claim 3 wherein said coils are interconnected in a manner forming a continuous gasket.

5. The resilient electromagnetic shielding device according to claim 4 wherein said coils are interconnected in a manner forming a circular axially resilient gasket.

6. The resilient electromagnetic shielding device according to claim 5 wherein said coils are interconnected in a manner such that the trailing portion is along an inside diameter of the gasket and the leading portion is along an outside diameter of the gasket.

7. The resilient electromagnetic shielding device according to claim 5 wherein said coils are interconnected in a manner such that the trailing portion is along an outside diameter of the gasket and the leading portion is along an inside diameter of the gasket.

8. A resilient electromagnetic shielding device according to claim 7 wherein said means for preloading comprises means for defining a groove for holding said plurality of conductive wire coils and wedge means for deflecting the plurality of coils along a minor axis thereof.

9. The resilient electromagnetic shielding device according to claim 8 wherein said wedge means is suspended in said groove means and biased by said plurality of coils against an opposing loading surface.

10. The resilient electromagnetic shielding device according to claim 8 wherein said wedge means is fixed to an opposing loading surface, said opposing loading surface being biased by said plurality of coils.

11. The resilient electromagnetic shielding device according to claim 1 wherein said coils are interconnected in a manner forming a circular axially resilient gasket and said seal-load portion is disposed adjacent an inside diameter of the circular axially resilient gasket, said seal-load portion of each coil collectively defining a load circle.

12. The resilient electromagnetic shielding device according to claim 11 further comprising means, compressing said circular axially resilient gasket along a minor axis thereof, for reducing the load circle.

13. The resilient electromagnetic shielding device according to claim 12 wherein the means for preloading comprises means defining a groove and said means comprising said circular axially resilient gasket comprises a wedge disposed in said groove.

14. The resilient electromagnetic shielding device according to claim 13 wherein said wedge is disposed in a fashion enabling movement thereof with the coils upon loading thereof.

15. The resilient electromagnetic shielding device according to claim 13 wherein said wedge is fixed.

16. A resilient electromagnetic shielding device according to claim 1 wherein said plurality of coils has a major axis and a minor axis with respect to the centerline and said means for preloading said plurality of coils comprises means defining a groove for holding said plurality of conductive wire coils with wedge portion means for deflecting the plurality of coils along a minor axis thereof.

17. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof;

means for preloading said plurality of coils in a manner causing adjoining coils to abutt one another only along a seal-load portion on the circumference thereof to provide shielding against the passage of electromagnetic energy, other coil portions on the circumference of adjoining coils remaining in a spaced apart relationship.

18. The resilient electromagnetic shielding device according to claim 17 further comprising insert means, disposed between abutting coils, for limiting passage of electromagnetic energy through an area subtended by the surface of each abutting coil and a loading surface contacting said abutting coils.

19. The resilient electromagnetic shielding device according to claim 18 wherein said insert means comprises a conductive wire having a generally round cross section.

20. The resilient electromagnetic shielding device according to claim 18 wherein said insert means comprises a conductive wire having a generally triangular cross-section.

21. The resilient electromagnetic shielding device according to claim 17 further comprising back angle means for both defining the disposition of a trailing portion of each coil with respect to a line normal to the centerline and for determining the working resilient range of the gasket and front angle means for defining the disposition of a leading portion of each coil with respect to the normal line, said front angle means being greater than said back angle means.

22. The resilient electromagnetic shielding device according to claim 21 wherein the back angle means defines a working resilient range wherein the gasket exerts a generally constant force in response to deflection of the gasket.

23. The resilient electromagnetic shielding device according to claim 20 wherein said coils are interconnected in a manner forming a continuous gasket.

24. The resilient electromagnetic shielding device according to claim 23 wherein said coils are interconnected in a manner forming a circular axially resilient gasket.

25. The resilient electromagnetic shielding gasket according to claim 24 wherein said coils are interconnected in a manner such that the trailing portion is along an inside diameter of the gasket and the leading portion is along an outside diameter of the gasket.

26. The resilient electromagnetic shielding device according to claim 24 wherein said coils are interconnected in a manner such that the trailing portion is along an outside diameter of the gasket and the leading portion is along an inside diameter of the gasket.

27. A resilient electromagnetic shielding device according to claim 17 wherein said means for loading comprises means for defining a groove for holding said plurality of conductive wire coils and wedge means for deflecting the plurality of coils along a minor axis thereof.

28. The resilient electromagnetic shielding device according to claim 27 wherein said wedge means is suspended in said groove means and biased by said plurality of coils against an opposing loading surface.

29. The resilient electromagnetic shielding device according to claim 27 wherein said wedge means is fixed to an opposing loading surface, said opposing loading surface being biased by said plurality of coils.

30. The resilient electromagnetic shielding device according to claim 17 wherein said coils are interconnected in a manner forming a circular axially resilient device and said seal-load portion is disposed adjacent an inside diameter of the circular axially resilient gasket, said seal-load portion of each coil collectively defining a load circle.

31. The resilient electromagnetic shielding device according to claim 30 further comprising means, comprises said circular axially resilient gasket along a minor axis thereof, for reducing the load circle.

32. The resilient electromagnetic shielding device according to claim 31 wherein the means for preloading comprises means defining a groove and said means comprising said circular axially resilient gasket comprises a wedge disposed in said groove.

33. The resilient electromagnetic shielding device according to claim 32 wherein said wedge is disposed in a fashion enabling movement thereof with the coils upon loading thereof.

34. The resilient electromagnetic shielding device according to claim 32 wherein said wedge is fixed relative to coil loading.

35. A resilient electromagnetic shielding device according to claim 17 wherein said plurality of coils has a major axis and a minor axis with respect to the centerline and said means for preloading said plurality of coils comprises means defining a groove for holding said plurality of conductive wire coils with wedge portion means for deflecting the plurality of coils along the minor axis thereof.

38. The resilient electromagnetic shielding device according to claim 35 further comprising back angle means for both defining the disposition of a trailing portion of each coil with respect to a line normal to the centerline and for determining the working resilient range of the gasket and front angle means for defining the disposition of a leading portion of each coil with respect to the normal line, said front angle means being greater than said back angle means.

39. The resilient electromagnetic shielding device according to claim 38 wherein the back angle means defines a working resilient range wherein the gasket exerts a generally constant force in response to deflection of the gasket.

36. A resilient electromagnetic shielding device comprising:

a plurality of conductive coil means, interconnected and canted along a centerline thereof, for causing the gasket to exert a generally constant force over a selected range of deflection of the gasket in response to loading thereof;

means, orienting said plurality of coil means at a turn angle for controlling the magnitude of the generally constant force within the selected range of deflection and for causing coil spacing along the circumference of adjoining coils to be less along a seal-load portion thereof than along other coil portions on the circumference of adjoining coils, said coil spacing along the seal-load portion being selected to limit the passage of electromagnetic energy with a wavelength greater than a selected value, said turn angle being greater than zero degrees and less than 90 degrees.

37. The resilient electromagnetic shielding device according to claim 36 wherein said turn angle is about 45 degrees.

40. The resilient electromagnetic shielding device according to claim 37 wherein said coils are interconnected in a manner forming a continuous gasket.

41. The resilient electromagnetic shielding device according to claim 40 wherein said coils are interconnected in a manner forming a circular axially resilient gasket.

42. The resilient electromagnetic shielding device according to claim 41 wherein said coils are interconnected in a manner such that the trailing portion is along an inside diameter of the gasket and the leading portion is along an outside diameter of the gasket.

43. The resilient electromagnetic shielding device according to claim 42 wherein said coils are interconnected in a manner such that the trailing portion is along an outside diameter of the gasket and the leading portion is along an inside diameter of the gasket.

44. A resilient electromagnetic shielding device according to claim 36 wherein said means for orienting said plurality of coil means comprises means for defining a groove for holding said plurality of conductive wire coils and wedge means for deflecting the plurality of coils along the minor axis thereof.

45. The resilient electromagnetic shielding device according to claim 44 wherein said wedge means is suspended in said groove means and biased by said plurality of coils against an opposing loading surface.

46. The resilient electromagnetic shielding device according to claim 44 wherein said wedge means is fixed to an opposing loading surface, said opposing loading surface being biased by said plurality of coils.

47. The resilient electromagnetic shielding device according to claim 44 wherein said coils are interconnected in a manner forming a circular axially resilient gasket and said seal-load portion is disposed adjacent an inside diameter of the circular axially resilient gasket, said seal-load portion of each coil collectively defining a load circle.

48. The resilient electromagnetic shielding device according to claim 47 further comprising means, comprises said circular axially resilient gasket along a minor axis thereof, for reducing the load circle.

49. The resilient electromagnetic shielding device according to claim 48 wherein the means for loading comprises means defining a groove and said means comprising said circular axially resilient gasket comprises a wedge fixed in said groove.

50. The resilient electromagnetic shielding device according to claim 49 wherein said wedge is disposed in a fashion enabling movement thereof with the coils upon loading thereof.

51. The resilient electromagnetic shielding device according to claim 50 wherein said wedge is fixed relative to coil loading.

52. A resilient electromagnetic shielding device according to claim 44 wherein said plurality of conductive coil means has a major axis and a minor axis with respect to the centerline and said means for preloading said plurality of coils comprises means defining a groove for holding said plurality of conductive wire coils with wedge portion means for deflecting the plurality of coils along the minor axis thereof.

56. The resilient electromagnetic shielding device according to claim 50 wherein said wedge is fixed.

53. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof;

said coils being interconnected in a manner forming a circular radially resilient gasket;

means for preloading said plurality of coils in a manner causing coil spacing along the circumference of adjoining coils to be less along a seal-load portion thereof than along other coil portions on the circumference of adjoining coils, said coil spacing along the seal-load portion being selected to limit the passage of electromagnetic energy with a wavelength greater than a selected value.

54. The resilient electromagnetic shielding device according to claim 53 wherein the means for preloading comprises means defining a groove and said means compressing said circular radially resilient gasket comprises a wedge disposed in said groove.

55. The resilient electromagnetic shielding device according to claim 54 wherein said wedge is disposed in a fashion enabling movement thereof with the coils upon loading thereof.

57. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof, said coils being interconnected in a manner forming a circular radially resilient gasket;

means for preloading said plurality of coils in a manner causing adjoining coils to abutt one another only along a seal-load portion on the circumference thereof to provide shielding against the passage of electromagnetic energy, other coil portions on the circumference of adjoining coils remaining in a spaced apart relationship.

58. The resilient electromagnetic shielding device according to claim 57 wherein the means for preloading comprises means defining a groove and wedge means, disposed in said groove, for deflecting the plurality of conductive wire coils along a miner axis thereof.

59. The resilient electromagnetic shielding device according to claim 58 wherein said wedge is disposed in a fashion enabling movement thereof with the coils upon loading thereof.

60. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof, and having a major and a minor axis with respect thereto;

means for loading said plurality of coils in a manner causing coil spacing along the circumference of adjoining coils to be less along a seal-load portion thereof than along other coil portion on the circumference of adjoining coils, said coil spacing along the seal-load portion being selected to limit the passage of electromagnetic energy with a wavelength greater than a selected value.

61. A resilient electromagnetic shielding device comprising:

a plurality of conductive wire coils canted along a centerline thereof, and having a major and a minor axis with respect thereto;

means for loading said plurality of coils in a manner causing adjoining coils to abutt one another only along a seal-load portion on the circumference thereof to provide shield against the passage of electromagnetic energy, other coil portions on the circumference of adjoining coils remaining in a spaced apart relationship.