Timed electric switch
US4276483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1978 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Dec 11, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A timed electric switch in a housing preferably for direct current loads such as for heating elements in vehicle windows, in which manually closable contacts supply current to the load and also to a digital timing circuit, which completes a circuit from said contacts through a holding solenoid for the contacts. After a predetermined count has been achieved in the timing circuit, the current supply through the holding solenoid is interrupted thereby releasing the contacts. Provision is made for allowing the second and subsequent timing periods to differ from the first timing period by independently supplying potential to the timing circuit, such as through the vehicle ignition switch. Reset of the timing circuit to produce the initial timing period once again is effected by switch off and re-operation of the ignition switch. An illuminated indication is provided, preferably by a light emitting diode, which operates when power is supplied to the load. Provision is made for altering the length of the second and subsequent time periods with respect to the initial timing period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.