Printed circuit board ground clip

• US 5,647,748 A
• Filed: 07/14/1995
• Issued: 07/15/1997
• Est. Priority Date: 07/14/1995
• Status: Expired due to Term

• Current Assignee: Dell USA LP (Dell Technologies Inc.)
• Original Assignee: Dell Computer Corporation (Dell Technologies Inc.)
• Inventors: Sands, Steve L., Mills, R. Steven, Gandre, Jerry D., Khadem, Gita P.
• Primary Examiner(s): Abrams, Neil
• Assistant Examiner(s): BIGGI, BRIAN JOSEPH
• Application Number:
  US08/502,409
• Time in Patent Office: 732 Days
• Field of Search: 439/92, 439/95, 439/75-79, 439/947, 439/81-83, 174/35 R, 174/51, 361/816, 361/817
• US Class Current: 439/81
• CPC Class Codes: H01R 12/58 terminals for insertion into holes
• CPC Class Codes: H01R 13/658 High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse] coaxial coupling devices specially adapted for high frequency H01R24/40; for flat or ribbon cable connectors H01R12/774; for coaxial cable H01R9/05
• CPC Class Codes: H05K 9/0039 Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218
• CPC Class Codes: Y10S 439/947 PCB mounted connector with ground terminal

Abstract

A printed circuit board ground clip is provided having upwardly extending retainers and downwardly extending legs. The legs are designed to insert within plated-through holes of a variable thickness printed circuit board. The upwardly extending retainers terminate as a spaced pair of flanges which frictionally receive and electrically couple with a hook. The hook extends from the chassis of an electronic device, through a slot within the printed circuit board and between the spaced flanges. Accordingly, the hook and ground clip form an electrical conduit between a ground supply connected to the electronic device chassis and a ground conductor formed within the printed circuit board. Chassis-to-ground conductor attachment is performed during assembly of the board to the chassis backplane. Attachment can be quickly and easily reversed to allow board re-work, without requiring placement of heat upon the board. The present attachment mechanism further avoids user-inserted fasteners and the reliability problems they present.

Claims

1. A printed circuit board ground clip, comprising:

an elongated base having two end portions which are bent to extend substantially parallel to each other at a spaced distance from each other;

at least one leg extending from a first side of each said two end portions;

a retainer extending from a second side opposite the first side of each said two end portions, wherein said retainer terminates as a flange; and

a ground supply bearing hook dimensioned to extend through said ground clip so as to frictionally engage with said flanges of said ground clip, and additionally frictionally engage with a printed circuit board supporting said ground clip by laterally moving said printed circuit board relative to said hook so that a groove in said hook embraces a top and a bottom surface of said printed circuit board.

2. The printed circuit board ground clip as recited in claim 1, wherein the flange of one said retainer is adapted to separate from the flange of the other said retainer upon ingress of said hook placed therebetween.

3. The printed circuit board ground clip as recited in claim 2, wherein said hook comprises a pair of opposed side surfaces upon which the flange of one said retainer and the flange of the other said retainer frictionally abut.

4. The printed circuit board ground clip as recited in claim 3, wherein said frictional abutment comprises an electrically conductive path between said ground clip and said hook.

5. The printed circuit board ground clip as recited in claim 1, wherein the leg extending from said two portions is configured for placement into a plated hole formed within a printed circuit board.

6. The printed circuit board ground clip as recited in claim 1, further comprising a key extending from the first side of each said two portions, wherein a distance between the key extending from one of said two portions and one terminal end of said elongated base is equal to a distance between the key extending from the other of said two portions and the other terminal end of said elongated base.

7. The printed circuit board ground clip as recited in claim 6, wherein said key extending from each said two portions is configured for placement into a plated hole formed within a printed circuit board.

8. The printed circuit board ground clip as recited in claim 1, wherein said ground clip is a metal selected from the group consisting of Be, Cu, C and steel.

9. An assembly for electrically connecting a ground supply to a ground conductor of a printed circuit board, comprising:

a printed circuit board having an elongated slot extending through the board between opposed planar surfaces of the board, said board further having plated holes extending as two rows across a portion of said board wherein said rows are spaced substantially parallel to each other and each of the plated holes is electrically connected to a ground conductor configured across a portion of said board;

a ground clip having a spaced plurality of legs and a pair of retainers extending from the ground clip toward one another, said legs are adapted for solder retention within respective said plated holes and flanges at terminal ends of said retainers are adapted to separate and bear against sides of a ground supply bearing hook; and

said ground supply bearing hook dimensioned to extend through said elongated slot so as to frictionally engage with said flanges of said ground clip, and additionally frictionally engage with a printed circuit board supporting said ground clip by laterally moving said printed circuit board relative to said hook so that a groove of said hook embraces a top and a bottom surface of said printed circuit board.

10. The assembly as recited in claim 9, wherein said ground conductor extends across a portion of one of said opposed planar surfaces.

11. The assembly as recited in claim 9, wherein said ground conductor extends along an intermediate planar region arranged parallel to and insulatively spaced between said opposed planar surfaces.

12. The assembly as recited in claim 9, wherein said hook comprises an electrically conductive material connected to a chassis upon which said printed circuit board is attached.

13. The assembly as recited in claim 9, wherein said hook extends from and is electrically coupled to a chassis, and wherein the chassis is electrically coupled to a ground supply.

14. The assembly as recited in claim 9, wherein said flanges are made of electrically conductive material which electrically contacts the sides of said hook.

15. The assembly as recited in claim 9, wherein each of said plurality of legs are bent from a substantially straight position to an arcuate position, and wherein a first set of said legs are bent at a location closer to the end of said respective legs than a second set of said legs.

16. The assembly as recited in claim 15, wherein said first set of legs are bent at a location which abuts, during placement of said legs into said plated holes, against one of the opposed planar surfaces of a board of first thickness, and wherein said second set of legs are bent at a location which abuts, during placement of said legs into said plated holes, against one of the opposed planar surfaces of a board of second thickness.

17. A method for applying a ground potential to a ground conductor of a printed circuit board, comprising:

providing a ground potential to a hook extending upward from a computer chassis;

forming a ground conductor across a printed circuit board having a slot formed through the board and a row of plated holes arranged on opposing sides of the slot;

providing a ground clip having a plurality of legs extending downward and a pair of retainers extending upward connected to the legs;

inserting the legs of said ground clip into said plated holes and soldering said legs to said plated holes;

placing the slot over the hook to electrically couple the hook between the pair of retainers; and

moving the board in a lateral direction relative to the hook to frictionally dispose an inward facing surface of the hook upon the board at one end of said slot.

18. The method as recited in claim 17, wherein the step of soldering said legs comprises wave soldering.

19. The method as recited in claim 17, wherein the step of providing the ground potential comprises connecting a ground supply to the computer chassis.

20. The method as recited in claim 17, wherein the step of moving the board occurs simultaneous with inserting an edge of the board into connectors configured upon a backplane of said chassis.