Exit control and surveillance system

Details Exit control and surveillance system Exit control and surveillance system

1987-02-17

1989-02-07

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With meter reading

340528, 340541, 292 92, 70 92, 70271, 49 30, 49 32, G08B 2500, G08B 1308

Patent

active

048034827

ABSTRACT:
In the system, exits are provided with opening bars and locks. The system has a central post and control boxes. Each control box is associated with an exit and is connected to the central post. Activation of an opening bar initiates the sending of information to the central post by the associated control box. This triggers a first delay To. During this delay, the opening of the exit can be stopped for a further delay Tc. The opening is allowed at the end of the first delay or at the end of the second delay. A third delay Tp can be triggered during the second delay Tc to allow the opening of the exit under question during the third delay Tp and to relock the exit under question at the end of the third delay Tp, by cancelling the effect of the second delay Tc. The system can also operate in the anti-intrusion mode. In particular, it can be used in stores or public establishments of medium area.

REFERENCES:
patent: 3950678 (1976-04-01), Brewer
patent: 4631528 (1986-12-01), Handel et al.
patent: 4652862 (1987-03-01), Verslycken

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