Richard G Gibb

US Patent:

62117793, Apr 3, 2001

Filed:

Sep 22, 1994

Appl. No.:

8/310637

Inventors:

Richard G. Gibb - Olympia Fields IL
Paul D. Graham - La Grange Park IL

Assignee:

Federal Signal Corporation - University Park IL

International Classification:

B06Q 154

US Classification:

340466

Abstract:

Method and apparatus for increasing the effectiveness of emergency signalling devices on vehicles. An emergency signalling device such as a flashing light is repeatedly operated at a frequency rate that corresponds to the speed of the vehicle. A minimum repetition rate is employed when the vehicle is slow or stopped so that the signal is not similarly halted, and a maximum rate is employed above a certain speed so that the repetition rate is not at too high of a frequency to be perceived.