Method and apparatus for simultaneously actuating navigational lanterns
US4620190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1984 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Jul 30, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B2045/005
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for causing a plurality of navigational lanterns, each equipped with an independent light sensing device and connected to a common synchronizing terminal, to actuate simultaneously at dusk, and deactuate simultaneously at dawn. The light sensing device senses the three levels of day, twilight and night. When a sensing device senses day, the connected lantern is disabled from flashing and is disabled from sending a synchronizing signal to other lanterns to flash. When a sensing device senses twilight, the connected lantern is enabled to receive the synchronizing signal, but is disabled from sending a synchronizing signal. When the sensing device senses night, the connecting lantern is enabled and a synchronizing signal to flash is sent to all of the lanterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.