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PEDESTAL SUPPORT FOR COTS PCBS PARALLEL TO A SURFACE

IP.com Disclosure Number: IPCOM000009363D
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-20
Document File: 3 page(s) / 131K

Publishing Venue

Motorola

Related People

Mark Summers: AUTHOR

Abstract

This paper describes a method of supporting commercially available motherboards, backplanes and daughter cards in rugged environments. These commercial off the shelf (COTS) Printed Circuit Boards (PCBs) such as motherboards, backplanes and daughter cards are usually supported away from a parallel surface by standoffs attached to either mounting holes or edges. These standoffs are not always located in the best locations to protect the COTS PCBs from experiencing damaging deflec- tion due to shock or vibration loads in rugged envi- ronments. The support mechanism described in this paper solves damaging deflection problem and still allows simple assembly and disassembly of the COTS PCBs from the parallel surface. This support mechanism is important because more and more COTS PCBs are being used in equipment which is being designed for severe environments such as mi- itary, aerospace and industrial applications.

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MOlOROLA Technical Developments

PEDESTAL SUPPORT FOR COTS ~ PCBS PARALLEL TO A SURFACE:

by Mark Summers

ABSTRACT

  This paper describes a method of supporting commercially available motherboards, backplanes and daughter cards in rugged environments. These commercial off the shelf (COTS) Printed Circuit Boards (PCBs) such as motherboards, backplanes and daughter cards are usually supported away from a parallel surface by standoffs attached to either mounting holes or edges. These standoffs are not always located in the best locations to protect the COTS PCBs from experiencing damaging deflec- tion due to shock or vibration loads in rugged envi- ronments. The support mechanism described in this paper solves damaging deflection problem and still allows simple assembly and disassembly of the COTS PCBs from the parallel surface. This support mechanism is important because more and more COTS PCBs are being used in equipment which is being designed for severe environments such as mi- itary, aerospace and industrial applications.

PROBLEMS WITH COTS PCBS PARALLEL TO A SURFACE

  As mentioned above, COTS PCBs are being pressed into service in ways that sometimes exceed the original design intent. For instance, many COTS PCBs are being used in military, aerospace and industrial applications which have severe shock and vibration environments. Most of the COTS motherboard, backplane and daughter cards (COTS PCBs parallel to a surface) are susceptible to center deflections in the presence of shock and vibration loadings. This is due to the fact that most COTS PCBs do not always provide standoffs in the best

locations to protect the COTS PCBs from experi- encing this damaging deflection (see Figure 1). All known standoffs and PCB attachments for 'COTS PCBs parallel to the surface' require mounting holes or require edge mounting (also see Figure 1). In addition, COTS PCBsi sometimes need to be removed due to obsolescence. Hence it is necessary to find a means of supp...