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Title:
ALARM FOR VEHICLE KEY ALLOWED TO REMAIN INSERTED
Document Type and Number:
Japanese Patent JPH03189254
Kind Code:
A
Abstract:

PURPOSE: To prevent surely a key from being allowed to remain with simple constitution by providing a magnetism sensitive switch closed when a magnet key is inserted in a key cylinder lock of a vehicle to give an alarm on the basis of the output of a door switch when the key is allowed to remain inserted.

CONSTITUTION: When a magnet key 7 having a key body 7a provided on the upper portion with a plurality of magnets g1, g2 is inserted in a key hole 8 of a key cylinder lock 1, a plurality of magnet pin tumblers 9a, 9b accommodated in a bore of an outer tube member 2 and a groove of an inner tube member 5 of the key cylinder lock 1 spring up against a spring 10 with a magnetic repulsion force to close a magnetism sensitive switch 11. While the magnetism sensitive switch 11 is closed, when a door of a vehicle is opened, a door switch 12 is turned on and an alarm 14 such as a buzzer connected in series to both switches 11, 12 is blown to alarm that the magnet key 7 is being inserted into the key cylinder lock 1.


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Inventors:
WAKE KIYOYASU
Application Number:
JP1989000327752
Publication Date:
August 19, 1991
Filing Date:
December 18, 1989
Export Citation:
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Assignee:
NIPPON DENSHI LOCK KK
International Classes:
E05B45/06; B60Q5/00; B60Q9/00; B60R25/10; B60R25/104; B60R25/20; E05B83/00; E05B83/36; (IPC1-7): B60Q5/00; B60Q9/00; B60R25/10; E05B45/06; E05B65/20
Domestic Patent References:
JPS63159159A1988-07-02
JPS6376166U1988-05-20
JPS62289454A1987-12-16
JPS6051278A1985-03-22