Motor vehicle headlight control apparatus

US3993914A · kind A · utility

Assignee

• Unican Security Systems Corporation · CA

Inventors

• John H. Conrad · Alpharetta, US
• Joseph P. Seemann · Rawdon, CA

Key dates

• Filing date: Mar 31, 1975
• Grant date: Nov 23, 1976
• Expiry date: Mar 31, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60Q9/001
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In a vehicle having an ignition switch, headlights and a storage battery, a relay has its winding in series with the battery and the collector-emitter circuit of a transistor and has normally open contacts in a headlight energizing circuit. A resistance-capacitance time delay circuit, connected with the ignition switch, controls bias of the transistor. Hence the transistor conducts whenever the ignition switch is "on" and for a short time after it is turned off; and while it conducts, the relay contacts are closed and the lights are energized.