Switch mechanism with seal
US7078639B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2005 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Mar 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H27/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch mechanism embodying the invention comprises a switch head assembly with at least one stationary contact and at least one movable contact carried by an axially movable contact carrier, a cam head assembly, a plunger assembly with a sealing element and a U-shaped yoke. The sealing element comprises a bellows seal having an outer peripheral rim that is trapped between the switch assembly housing and the tulip end of the cam head housing on assembly thereof. The bellows seal further comprises an inner annular part that is over molded onto the plunger body where and has a relieved portion comprising V-shaped troughs and ridges and undercutting in the form of annular grooves that open towards one another. The relieved portion provides a positive connection between the sealing element and the plunger and the tracking path for preventing liquid ingress is increased significantly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.