Direction indicating flasher device for vehicles with filament failure indication
US4910496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jan 11, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q11/007
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A flasher device flashes a selected one of a plurality of groups of indicator lamps selected by a flasher starting switch. An intermittent voltage is supplied to the selected group of indicator lamps to cause the lamps to flash. A capacitor is operatively connected to the selected group of indicator lamps and the rate of change of the voltage across the capacitor is indicative of the resistance of the selected group of indicator lamps. The frequency of the intermittent voltage supplied to the indicator lamps to flash the lamps is varied in response to the rate of change of the voltage across the capacitor. As the rate of change of voltage across the capacitor varies in relationship to the resistance of the selected group of indicator lamps, the change in the frequency of the intermittent voltage supplied the indicator lamps and thus the flash rate of the indicator lamps is representative of the resistance of the group of lamps. Thus the flash rate indicates to the operator of the vehicle when a filament has been broken. An audible announcement of the automatic reset of the flasher may also be developed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.