Secondary security ignition switch system

US5696408A · kind A · utility

Inventor

• Kenneth Man · North York, CA

Key dates

• Filing date: Aug 30, 1996
• Grant date: Dec 9, 1997
• Expiry date: Aug 30, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R25/04
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A secondary ignition switch system that connects to a conventional ignition switch system of a vehicle to provide a security function. The secondary ignition system includes a dashboard mounted double-pole-double-throw (DPDT) switch and a key operated secondary ignition switch. The DPDT switch controls the operation of the primary and secondary ignition switches. To start the engine the DPDT is set to a position to power the secondary ignition switch, such that the engine can be started by turning a secondary key. However, based on the interconnection of the ignition switches the steering column of the vehicle remains locked. Only until the operator uses the primary key to unlock the steering assembly can the car be driven. This system enables the engine of a vehicle to run including powering the accessory circuit (for heating/cooling and power accessories) to warm a vehicle in cold climates with minimized risk since the steering assembly remains locked. In addition, when the secondary key is removed from the secondary ignition switch no current flows to the primary ignition switch rendering the entire system disabled.