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Browse Prior Art Database

LOW COMPRESSION LOAD HOUSING SEAL

IP.com Disclosure Number: IPCOM000006723D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-25
Document File: 2 page(s) / 79K

Publishing Venue

Motorola

Related People

Thomas Bock: AUTHOR

Abstract

Sealing electrical assemblies can be a problem when using containment housings made horn plastic. The high clamping load required for most rigid seals results in both short and long term housing distortion, and possi- ble stress rupture. At the very least the distortion can allow unloading of the seal and subsequent leakage. Rigidizing the housing for the seal requirements is not always practical, or cost effective.

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MO-LA INC. Technical Developments Volume 17 December 1992

LOW COMPRESSION LOAD HOUSING SEAL

by Thomas Bock

  Sealing electrical assemblies can be a problem when using containment housings made horn plastic. The high clamping load required for most rigid seals results in both short and long term housing distortion, and possi- ble stress rupture. At the very least the distortion can allow unloading of the seal and subsequent leakage. Rigidizing the housing for the seal requirements is not always practical, or cost effective.

  To overcome these limitations a water tight seal con- figuration has been developed to function from elastic bending of its cross section under a uniform clamping load. This design provides a low compression load with the.abiity to seal under widely varying clamp displace- ments. See the figure for details.

  The seal consists of a form molded rubber polymer contiguration which follows the outside contour of the plastic housing and is located by a rigid clamping groove on both sides of the seal. Each housing groove can pro- vide two contact points for the seal to sit on. The elastic clamping load is designed to provide the required con- tact pressure to resist leakage past the seal surfaces. Once the seal buckles under the assembly preload the clamping load remains nearly constant over a broad range of

clamping displacements.

  Special consideration to the seal design is required in the corners where the seal changes direction. A stress stiffening oc...