Vehicle window heater control device
US3944893A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/035
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The specification discloses a control device for an automotive window heater energized by an alternator having a field winding and comprising a manual switch terminal, an ignition terminal, a battery terminal, indicator terminal, field winding terminal and a ground terminal; a first normally open relay having a winding and a first normally open armature switch; a triggerable switch device electrically in series with said first relay winding between said ignition terminal and ground; a trigger circuit for said triggerable switch electrically disposed between ground and said manual switch terminal; a timing circuit including a chargeable condenser; a second relay having a winding and a second normally open armature switch; and a voltage responsive switch responsive to a voltage greater than a predetermined value and electrically in series with said winding of said second relay between ground and said indicator terminal; said first and second relay switches when closed connecting said indicator terminal respectively to said battery terminal and said field winding terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.