Shielded equipment enclosure

• US 4,777,565 A
• Filed: 03/06/1987
• Issued: 10/11/1988
• Est. Priority Date: 03/15/1986
• Status: Expired due to Fees

• Current Assignee: Burroughs Corporation Detroit Michigan
• Original Assignee: Unisys Corporation
• Inventors: McIntosh, Rennie F.
• Primary Examiner(s): Scott, J. R.
• Assistant Examiner(s): Thompson, Gregory D.
• Application Number:
  US07/023,017
• Time in Patent Office: 585 Days
• Field of Search: 174/32, 174/35 R, 174/35 MS, 174/51, 220/4 R, 220/4 F, 220/4 C, 220/76, 220/84, 312/108, 312/257 SK, 361/390-391, 361/395, 361/399, 361/424, 361/428-429
• US Class Current: 361/816
• CPC Class Codes: H05K 9/0045 being rigid plastic containers having a coating of shielding material

Abstract

An equipment enclosure comprises a frame, a top panel, two side panels, front and rear panels, and front and rear base panels. The side panels are held on the frame using studs fitted into recesses in the frame. The top cover rests on a top face of the frame and engages the studs to position the side panels relative to the frame. The front and rear panels are affixed respectively to a front edge and a rear edge of the top panel and affixed at their respective lower ends by the front base panel and the rear base panel. The tolerances are such that outside dimensions of the enclosure are entirely defined by the mutual engagement between the panels and the frame can occupy a range of positions within the completed enclosure. Each panel is coated with a conducting layer electrically connected to the frame by conducting gaskets providing electromagnetic shielding. Tip portions of the panels provide labyrintine paths between all points at the same electrical potential as the frame. The panels themselves are made of insulating material, thus prevent electrostatic discharge.

Claims

1. An equipment enclosure comprising;

an electrically conductive frame having first and second faces in abutment along a first common edge;

a first panel on said first face, said first panel having an electrically conducting inner surface and an electrically insulating outer surface, said inner surface of said first panel electrically coupled to said frame;

a second panel on said second face, said second panel having an electrically conducting inner surface and an electrically insulating outer surface, said inner surface of said second panel electrically coupled to said frame;

a first tip portion on said first panel, said first tip portion proximate to said first common edge;

a second tip portion on said second panel, said second tip portion proximate to said first common edge;

said electrically conducting inner surface of said first panel and said electrically conducting inner surface of said second panel each stopping short of said first common edge, thereby leaving an exposed region of said frame;

wherein said first tip portion is a first electrically insulating shield, said first shield positioned over said exposed region; and

wherein said second tip portion is a second electrically insulating shield, said second shield positioned over said first tip portion.

2. An enclosure according to claim 1 comprising a first electrically conductive support gasket between said inner surface of said first panel and said frame, said second panel having a standoff arm on said inner surface thereof, said standoff arm having an extremity proximate to said frame, a second electrically conductive support gasket between said extremity of said standoff arm and said frame, wherein said first and second electrically conductive support gaskets provide the electrical coupling of the inner surfaces of said first and second panels to said frame.

3. An enclosure according to claim 2 wherein each said support gasket is a carbon loaded elastomer gasket.

4. An enclosure according to claim 1 further characterized in that said electrically conductive frame has a third face in abutment with said first face along a second common edge;

a third panel on said third face, said third panel having an electrically conducting inner surface and an electrically insulating outer surface, said inner surface of said third panel electrically coupled to said frame;

a third tip portion on said first panel, said third tip portion proximate to said second common edge;

a fourth tip portion on said third panel, said fourth tip portion proximate to said second common edge;

said inner surface of said first panel and said inner surface of said third panel being electrically joined by an electrically conductive sealing gasket, said sealing gasket between and in contact with both said third tip portion and said fourth tip portion.

5. An enclosure according to claim 4 wherein said first panel is a glass reinforced polyester panel.

6. An enclosure according to claim 4 wherein said sealing gasket is a carbon loaded elastomer gasket.

7. An enclosure according to claim 4 wherein said third tip portion comprises a first staircase structure;

wherein said fourth tip portion comprises a second staircase structure of complementary outline to that of said first staircase structure; and

wherein said first and second staircase structures together form a labyrinthine path.

8. An enclosure according to claim 7 wherein said first and second staircase structures are cooperative to support said first panel on said third panel.

9. An enclosure according to claim 4 wherein:

said electrically conducting inner surface of said first panel comprises a first electrically conductive coating, said first coating continuing onto an inner surface of said third tip portion, around the distal end of said third tip portion and onto an outer surface of said third tip portion, said first coating terminating at and in contact with said electrically conductive sealing gasket; and

said electrically conducting inner surface of said third panel comprises a second electrically conductive coating, said second coating continuing onto an inner surface of said fourth tip portion, said second coating terminating at and in contact with said electrically conductive sealing gasket.

10. An enclosure according to claim 9 wherein said electrically conductive coating comprises a layer of nickel based paint.

11. An enclosure according to claim 4 wherein:

said frame is generally cubical in shape.