Pressure compensating element for electrical device enclosure
US4974745A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | May 5, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pressure equalizing element for an electrical device enclosure, e.g. for a control device under the hood of a vehicle, features a water-tight but air-transmitting region (6) which equalizes pressure between the interior airspace of the enclosure and ambient airspace. The element is preferably thimble-shaped so that all exterior surfaces are curved and water will not pool on it and clog the air pores. Thus, it will be operative, and can be installed, in any desired orientation. The thimble-shaped element preferably has a threaded (40) or dovetailed (4) rim which facilitates engagement with a correspondingly shaped aperture in the wall of the electrical device enclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.