Electronic access control device

  • US 6,359,547 B1
  • Filed: 12/04/1996
  • Issued: 03/19/2002
  • Est. Priority Date: 11/15/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. An electronic access control device comprising:

  • a solenoid coupled to a lock for opening and closing the lock;

    an energizing circuit for energizing the solenoid to open the lock;

    an input device for inputting a control signal for requesting access;

    a control circuit including first and second microprocessors, the second microprocessor being separated from the first microprocessor and shielded from external access, the first microprocessor coupled to the input device for receiving the control signal, the second microprocessor coupled to the energizing circuit for activation thereof, the first microprocessor including means for transmitting a communication code to the second microprocessor in response to the control signal, the second microprocessor including means for comparing the transmitted communication code to a preset communication code and activating the energizing circuit when the transmitted communication code matches the preset communication code, wherein the control circuit controls the energizing circuit to supply sufficient power to energize the solenoid to move a plunger of the solenoid into an open position to allow opening of the lock and then supply a lower non-zero amount of power to energize the solenoid to maintain the plunger in the open position for a preset time.

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