Keyless access control and security system

US4742327A · kind A · utility

Assignee

• Essex-Tec Corporation · US

Inventors

• James P. Burgess · Stuttgart, DE
• Peter N. Kaufman · Lompoc, US

Key dates

• Filing date: Dec 7, 1983
• Grant date: May 3, 1988
• Expiry date: Dec 7, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R25/1003
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A keyless access control and security system especially adapted for use with an automobile and including a piezoelectric permutation touchpad unit which can be affixed, without requiring bodywork, to the outside of the vehicle's door in the key cylinder aperture. The touchpad is illuminated when touched and is therefore usable in the dark. The person seeking access must enter the correct access code combination on the touchpad to open the door and/or the trunk. The touchpad is connected to a remotely located logic circuit which controls access. The circuit provides for a signal of low intensity, indicating that a correction in the code entered into the touchpad should be made and, after a time delay, an alarm of high intensity, if no correction is made. Upon activation of the alarm, the head lights are flashed, the horn is sounded, or both. In order to enable a parking attendant, repairman, or some other authorized person to have access to the automobile without revealing the access code, the logic circuit can be programmed, by operation of the touchpad, using the proper access code and a further secondary code, arbitrarily selected, to provide access to the automobile in response …