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Title:
DOUBLE LOCK APPARATUS
Document Type and Number:
Japanese Patent JP3403148
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a double lock apparatus which achieves locking and unlocking of a plurality of locks by using a single key, and requires a key operation according to a PIN number in order to unlock one of the locks.
SOLUTION: When the first lock 40 is mechanically locked with respect to a door 11 by using the single key 51, the second lock 20 is locked according to electric control in response to a detection signal of a sensor 41. When the first lock 40 is unlocked by using the key 51, rotational operation of the key 51 is detected by the sensor 41, and counting is carried out by a counting means. The thus counted value is compared with the PIN number determined beforehand, and when the former coincides with the latter, the second lock 20 is unlocked. If the PIN number is a value of a plurality of digits, a shift sensor 15 for shifting the digit of the count value is provided for the apparatus. In this manner, detection of an abnormal state is carried out according to a combination of a door opening sensor 35, and states of a lock sensor 31 and an unlock sensor 32 of the second lock 20. When supply voltage is lowered, the second lock which assumes a locking position is temporarily forcedly unlocked, and upon recovery of the supply voltage, the second lock is automatically restored to the original condition.


Inventors:
Hajime Nakamura
Application Number:
JP2000165458A
Publication Date:
May 06, 2003
Filing Date:
June 02, 2000
Export Citation:
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Assignee:
Hajime Nakamura
International Classes:
E05B35/12; E05B17/22; E05B45/06; E05B47/00; E05B49/00; E05B65/08; (IPC1-7): E05B35/12; E05B17/22; E05B45/06; E05B47/00; E05B49/00
Domestic Patent References:
JP11270204A
JP63179584U
Attorney, Agent or Firm:
Mutsuhiko Yamano



 
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