Switch lock installation

US4734693A · kind A · utility

Assignee

• Sachs Systemtechnik GmbH · DE

Inventors

• Joachim Dluhosch · Schweinfurt, DE
• Hans Fliege · Haßfurt, DE
• Dieter Lutz · Schweinfurt, DE
• Franz Nagler · Ottendorf, DE
• Horst Oppitz · Dittelbrunn, DE
• Christoph Thielen · Dittelbrunn, DE
• Wolfgang Thieler · Haßfurt, DE

Key dates

• Filing date: Jul 18, 1985
• Grant date: Mar 29, 1988
• Expiry date: Jul 18, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/7079
• WIPO field: Control
• WIPO sector: Instruments

Abstract

For controlling a central locking installation and/or theft alarm of a motor vehicle a switch lock installation is provided which comprises at least one lock with mechanical tumblers for the mechanical locking and unlocking of a door or a bonnet of the motor vehicle. The tumblers form a first key secret. The key which blocks the tumblers carries an electrically, magnetically or optically readable information carrier for a second, operationally variable key secret. A reading device detects the information of the second key secret in a position in which the mechanical tumblers of the lock are released. If the key is moved in the opening direction of the lock, a control circuit compares the information read by the reading device with an ideal information stored in a memory circuit and controls the central locking installation and/or theft alarm accordingly. If the key is moved in the closure direction of the lock, then the information of the second key secret read by the reading device is taken as new ideal information into the memory circuit.