Document Type and Number:
Japanese Patent JPH0248716
Kind Code:
B2
Abstract:
A device for detecting the removal of a cylinder lock used on cars, trunks, etc. when an unjust force is applied to the cylinder lock. The device also detects the locked and unlocked conditions of the cylinder lock. Magnets and magnetic sensor switches are used. A magnetic shield plate shields the flow of magnetic flux between the magnet and the magnetic sensor switch. When an unjust force is applied to the cylinder lock to take off the cylinder lock, the magnetic shield plate will be removed from between the magnet and the magnetic sensor switch, causing the magnet to energize the magnetic sensor switch, thereby detecting the removal of the cylinder lock. In addition, when the cylinder lock is turned by a key, another magnet connected to a rotor of fixed on the cylinder lock approaches either of a pair of magnetic sensor switches, whereby the locked and unlocked conditions of the cylinder lock are detected.
Inventors:
MOCHIDA HARUO
KAMIMURA ISAMU
KURITA TOKUTARO
KOBAYASHI RIICHI
KAMIMURA ISAMU
KURITA TOKUTARO
KOBAYASHI RIICHI
Application Number:
JP19971282A
Publication Date:
October 25, 1990
Filing Date:
November 16, 1982
Export Citation:
Assignee:
NITSUSAN JIDOSHA KK
KOKUSAN KINZOKU KOGYO KK
KOKUSAN KINZOKU KOGYO KK
International Classes:
E05B45/14; E05B45/06
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