Dual light source
US4461974A · kind A · utility
25Cited by
5References
5Claims
0Family size
Inventor
Key dates
| Filing date | Jun 9, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jun 9, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multiple lamp system for use with fiber optic light guide for automatically switching from a main lamp to a standby lamp upon failure of the former. A solenoid is employed with the inductor in the circuit of the main lamp to overcome the bias of the switch in the standby lamp circuit to keep the former open. When the main lamp fails causing interruption of current flow, the switch closes thereby permitting energization of the standby lamp. An indicator is provided to show which lamp is functioning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.