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Keys and related magnetic locks to control accesses

  • US 5,085,062 A
  • Filed: 09/27/1989
  • Issued: 02/04/1992
  • Est. Priority Date: 09/28/1988
  • Status: Expired due to Fees
First Claim
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1. In a magnetic locking system having keys and related magnetic locks, including a codifier circuit with a coded output signal transmitted to an electronic station that decodes and compares the output signal with a predetermined combination and actuates a means for releasing the related magnetic lock if the decoded output signal equals the combination, the improvement comprising a key comprising a bit with at least one recess arranged into at least one row of recesses, the at least one recess oriented transversely to the longitudinal axis of the key and capable being filled with a removable magnetized disk, the magnetized disk oriented in either magnetic polarity along the longitudinal axis of the at least one recess, the two possible orientations of the magnetic field of the magnetized disk and the possibility of an absence of a magnetic field if the at least one recess is empty forming a ternary state system of magnetic fields, the bit adapted to be covered by a slidable plate and provided with structure for holding the plate to the bit;

  • and a lock comprising structure for receiving the key, at least one magnetic sensor disposed in juxtaposition in the key receiving structure to the at least one key recess in the key bit when the key is inserted in the key receiving structure, the at least one magnetic sensor detecting a particular state of the ternary magnetic field state system and outputting a corresponding signal to the codifier circuit.

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