Federal Signal Corporation

Robert J Hartke

Jeffery M Loftus

Robert A Czajkowski

Duane P Belitz

Tim Skertich, Jr

Aaron Sowers

Adam Voss

Vincent S Fleszewski

Christopher Radzik

An electronically controlled motor driven siren. The siren is electronically controlled to generate different sound profiles, while having advantages of a motor driven mechanical siren. In some embodiments, the siren is part of a system of multiple sirens. The phases of the rotors of the sirens of the system can be electronically controlled to generate different multi-siren combined sound profiles.

Electronically controlled siren

Lighting unit that can be mounted to a vehicle for illuminating work or emergency areas at night. The lighting unit includes a mechanically controllable driver for selecting a position of a central optical axis of the light emitter and an electronically adjustable refractive element for modulating a beam spread configuration generated by the lighting unit.

Lighting unit with electronically modulated beam configuration

Lighting unit

Growing community of inventors

Beecher, IL, United States of America

Robert J Hartke