EP 0010870 A1 19800514 - Electronic lock and key, and an alarm system incorporating same.
Title (en)
Electronic lock and key, and an alarm system incorporating same.
Title (de)
Elektronisches Schloss mit Schlüssel und damit verbundenes Alarmsystem.
Title (fr)
Dispositif clé-serrure électronique et système d'alarme qui en est muni.
Publication
Application
Priority
GB 7839325 A 19781004
Abstract (en)
A key (26) comprises a resistor (R40) of a predetermined value which can be connected to a socket (S) of an electronic lock, where it forms a divider with a resistor (R29). A window comparator (A2, A3) determines whether or not a resistor in a certain range around the predetermined value has been connected and provides a signal accordingly. This lock and key is used to arm and disarm an intruder alarm in which changes in signal from an ultrasonic transmitter (U1) to an ultrasonic receiver (U2) caused by the presence of an intruder are detected.
IPC 1-7
IPC 8 full level
G07C 9/00 (2006.01); G08B 13/00 (2006.01)
CPC (source: EP)
G07C 9/00714 (2013.01); G08B 13/00 (2013.01)
Citation (search report)
- FR 2284017 A1 19760402 - ROUSSEEUW YVAIN [FR]
- CH 572148 A5 19760130 - STELLA LEO
- CA 884552 A 19711026 - SAUL BENNO
- DE 2458866 A1 19760616 - SPINNER GEORG
- FR 2270650 A1 19751205 - DETHOOR GILBERT [FR]
- FR 2298839 A1 19760820 - SONTRIX [US]
- CH 563632 A5 19750630 - MIRATRON AG
- US 4080594 A 19780321 - PLEVY ARTHUR L
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 79302065 A 19791001