Timed electric switch
US4370565A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A timed switch for controlling an electric load has a relay mounted within the switch housing. The relay has a pair of contacts which are connected to the load, a movable core connected to one of the contacts and a holding coil which holds the core in and holds the contacts closed when energized and releases them when deenergized. The switch also has a timer; and a manual actuator for moving the core and closing the contacts, actuating the timer and actuating the relay coil. The timer is connected to the relay coil to deenergize the coil and release the contacts upon expiration of a predetermined interval measured by the timer. The contacts may also be opened by actuation of the manual actuator without having to overcome the holding force of the relay coil on the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.