Apparatus and method for securing a printed circuit board to a base plate

• US 6,445,588 B1
• Filed: 01/02/2001
• Issued: 09/03/2002
• Est. Priority Date: 01/02/2001
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Beise, Thomas, Masterton, Patrick J.
• Primary Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US09/753,158
• Publication Number:
  US 20020085359A1
• Time in Patent Office: 609 Days
• Field of Search: 361/704, 361/707, 361/710, 361/752, 361/753, 361/759, 361/801, 257/717, 257/718, 257/719, 257/727, 220/4.02, 174/138.G, 248/560-562
• US Class Current: 361/759
• CPC Class Codes: H05K 7/1405 by clips or resilient members, e.g. hooks
• CPC Class Codes: H05K 7/142 Spacers not being card guides

Abstract

A PC board assembly employs an apparatus and method for securing a PC board to a base plate. Multiple compression force distributors are each attached at one end to the PC board. Each compression force distributor is preferably implemented as a compressible standoff that includes two end portions and a compressible body portion. The compressible body portion transfers a compression force applied to one end portion to the other end portion for application to the PC board. The PC board is positioned upon the base plate and the compression force is applied to the standoffs. During application of the compression force, the compressible body portions of the standoffs compress in only one direction toward the base plate, thereby distributing the compression force to the PC board to secure the board to the base plate. The method and apparatus may also be used to secure electrical components to the base plate.

Claims

1. An apparatus for use in securing at least one of a printed circuit board and an electrical component to a base plate, the apparatus comprising:

a first end portion that includes a substantially planar outer surface, the substantially planar outer surface of the first end portion being contactable by a source of a compression force;

a second end portion that includes a substantially planar outer surface, the substantially planar outer surface of the second end portion being contactable by the at least one of the printed circuit board and the electrical component; and

a compressible body portion connecting the first end portion to the second end portion, the compressible body portion transferring the compression force applied to the first end portion to the second end portion for application to the at least one of the printed circuit board and the electrical component, wherein the compressible body portion compresses in one direction without increasing in size in any other direction.

2. The apparatus of claim 1, wherein the second end portion comprises a solderable material and is soldered to the at least one of the printed circuit board and the electrical component substantially when one of the electrical component and at least one other electrical component is soldered to the printed circuit board.

3. The apparatus of claim 2, wherein the second end portion includes two subportions separated by a gap and wherein solder fills the gap when the second end portion is soldered to the at least one of the printed circuit board and the electrical component.

4. The apparatus of claim 2, wherein the solderable material is a copper alloy.

5. The apparatus of claim 4, wherein the copper alloy is beryllium copper.

6. The apparatus of claim 1, wherein the compressible body portion comprises:

a first angled member having a first end and a second end, the first end of the first angled member being connected to a first end of the first end portion, the first angled member forming an acute angle with the first end portion;

a second angled member having a first end and a second end, the first end of the second angled member being connected to a second end of the first end portion, the second angled member forming an acute angle with the first end portion;

a third angled member having a first end and a second end, the first end of the third angled member being connected to the second end of the first angled member, the second end of the third angled member being connected to a first end of the second end portion, and the third angled member forming an acute angle with the second end portion; and

a fourth angled member having a first end and a second end, the first end of the fourth angled member being connected to the second end of the second angled member, the second end of the fourth angled member being connected to a second end of the second end portion, and the fourth angled member forming an acute angle with the second end portion.

7. The apparatus of claim 1, wherein the compressible body portion includes a spring.

8. The apparatus of claim 1, wherein a surface area of the substantially planar outer surface of the first end portion is sufficient to facilitate automated pick-and-placement of the apparatus on the printed circuit board.

9. The apparatus of claim 1, wherein the first end portion, the second end portion and the body portion form an integrated device.

10. A printed circuit board assembly comprising:

a base plate;

a printed circuit board positioned upon the base plate;

a cover that applies a compression force toward the base plate when the cover is in a closed position; and

a plurality of compressible standoffs positioned between the cover and the printed circuit board, the plurality of compressible standoffs transferring the compression force applied by the cover to the printed circuit board such that the printed circuit board is secured to the base plate, each of the plurality of compressible standoffs compressing in one direction without increasing in size in any other direction.

11. The printed circuit board assembly of claim 10, wherein the printed circuit board includes at least one cutout area, the printed circuit board assembly further comprising:

at least one electrical component positioned within the at least one cutout area of the printed circuit board such that the at least one electrical component rests upon the base plate;

wherein at least one of the plurality of compressible standoffs is positioned between the cover and the at least one electrical component such that the at least one electrical component is secured to the base plate.

12. The printed circuit board assembly of claim 11, wherein the cover is pivotally attached to the base plate and includes a latching mechanism to enable the cover to attach to the base plate when the cover is in the closed position.

13. The printed circuit board assembly of claim 12, wherein the base plate forms part of a heat sink.

14. The printed circuit board assembly of claim 10, wherein each of the plurality of compressible standoffs comprises:

a first end portion that includes a substantially planar outer surface, the substantially planar outer surface of the first end portion being contactable by the cover;

a second end portion that includes a substantially planar outer surface, the substantially planar outer surface of the second end portion being contactable by the printed circuit board; and

a compressible body portion connecting the first end portion to the second end portion, the compressible body portion transferring the compression force applied to the first end portion by the cover to the second end portion for application to the printed circuit board, wherein the compressible body portion compresses in one direction without increasing in size in any other direction.

15. The printed circuit board assembly of claim 14, wherein at least the substantially planar outer surface of the second end portion is soldered to a receptacle area of the printed circuit board.

16. The printed circuit board assembly of claim 10, wherein the cover is prestressed in a direction of the base plate in order to supply the compression force.

17. A printed circuit board assembly comprising:

a base plate;

a printed circuit board positioned upon the base plate, the printed circuit board including at least one cutout area;

at least one electrical component positioned within the at least one cutout area of the printed circuit board such that the at least one electrical component rests upon the base plate;

a cover that applies a compression force toward the base plate when the cover is in a closed position; and

a plurality of compressible standoffs positioned between the cover and the printed circuit board and between the cover and the at least one electrical component, the plurality of compressible standoffs transferring the compression force applied by the cover to the printed circuit board and the at least one electrical component such that the printed circuit board and the at least one electrical component are secured to the base plate, each of the plurality of compressible standoffs compressing in one direction without increasing in size in any other direction.

18. The printed circuit board assembly of claim 17, wherein each of the plurality of compressible standoffs comprises:

a first end portion that includes a substantially planar outer surface, the substantially planar outer surface of the first end portion being contactable by the cover;

a second end portion that includes a substantially planar outer surface, the substantially planar outer surface of the second end portion being contactable by one of the printed circuit board and the at least one electrical component; and

a compressible body portion connecting the first end portion to the second end portion, the compressible body portion transferring the compression force applied to the first end portion by the cover to the second end portion for application to one of the printed circuit board and the at least one electrical component, wherein the compressible body portion compresses in one direction without increasing in size in any other direction.

19. The printed circuit board assembly of claim 17, wherein the cover is pre-stressed in a direction of the base plate in order to supply the compression force.

20. A method for securing a printed circuit board to a base plate, the method comprising the steps of:

providing a cover that applies a compression force toward the base plate when the cover is in a closed position;

positioning a plurality of compressible standoffs between the cover and the printed circuit board; and

using the plurality of compressible standoffs to transfer the compression force applied by the cover to the printed circuit board such that the printed circuit board is secured to the base plate, wherein each of the plurality of compressible standoffs compresses in one direction without increasing in size in any other direction.

21. The method of claim 20, wherein the step of providing comprises the step of providing a cover that is pivotally attached to the base plate and includes a latching mechanism, wherein the cover supplies the compression force when the cover is pivoted into a closed position and latched to the base plate.

22. The method of claim 20, further comprising the step of:

using at least some of the plurality of compressible standoffs to distribute the compression force to at least one electrical component attached to the printed circuit board to thereby secure the at least one electrical component to the base plate.