Access control device

Details Access control device Access control device

1995-03-27

1996-12-17

Pitts, Harold

Registers

Systems controlled by data bearing records

Credit or identification card systems

235375, 235380, 235492, G06K 500

Patent

active

055856144

ABSTRACT:
This access control device has at least one local control device (10) connected to a central control device (11) containing a local computer (18), an issuing station (12) for control cards and a lockable entry installation (13). At the issuing station (12) are issued portable control cards (47) with an electronic identity number is stored at each issue. A transmitting device 921) fitted at the entry installation (13) transmits a continuous series of signals corresponding to identity numbers recognized by the local computer (18) as valid. As soon as the comparator circuit finds a correspondence between transmitted and stored identity numbers, the transmission circuit of the control card is activated to send a release signal to open the entry installation, whereby the power to transmit the release signal is taken from the signals transmitted by the transmission device.

REFERENCES:
patent: 4036178 (1977-07-01), Lee
patent: 4236068 (1980-11-01), Walton
patent: 4353064 (1982-10-01), Stamm
patent: 4384288 (1983-05-01), Walton
patent: 4388524 (1983-06-01), Walton
patent: 4459474 (1984-07-01), Walton
patent: 4473825 (1984-09-01), Walton
patent: 4510495 (1985-04-01), Sigrimis
patent: 4600829 (1986-07-01), Walton
patent: 4918296 (1990-04-01), Fujisika
patent: 4918416 (1990-04-01), Walton et al.
patent: 5175418 (1992-12-01), Tanaka

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