Interlock means for switch enclosure
US4118607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1976 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Dec 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/223
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric switch mounted within an enclosure having a hinged cover is manually operated from outside the enclosure by a handle mechanism secured to the enclosure. The cover is provided with a single aperture near the edge thereof remote from the cover hinges, with this aperture providing clearance for the U-shaped operating handle of the mechanism when the cover is closed and also providing clearance for a catch which holds the cover closed. The mechanism also includes a defeatable cover interlock to prevent opening of the cover when the switch is closed, and a defeatable switch interlock to prevent closing of the switch when the cover is open. Each interlock comprises a flat member biased to an active position by a U-shaped wire spring, positioned for cooperation with different arms of the operating handle, and mounted for movement in planes perpendicular to the cover when the latter is closed. A formed wire loop pivotally mounted to the housing of the handle mechanism is provided to receive a padlock to lock the cover closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.