Stairwell security system

Details Stairwell security system Stairwell security system

1984-10-03

1986-05-20

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

34030915, 340522, 340545, 340567, G08B 1308, G08B 1318

Patent

active

045904600

ABSTRACT:
A security system includes an entry monitoring sensor for detecting movement into a first space, a first area monitoring sensor for detecting occupancy in the first space, at least one area monitoring sensor for detecting occupancy in at least one space adjacent the first space. The system further includes a timing device for measuring a first time period in response to actuation of the entry sensor and for measuring a second time period in response to the actuation of the first area sensor during the first time period. An alarm device indicates any suspicious occupancy at the expiration of the second time period in the absence of detection of occupancy by at least one of the area sensors for detecting occupancy in at least one space adjacent the first space.

REFERENCES:
patent: 2198725 (1940-04-01), Smith
patent: 2912540 (1959-11-01), Sawicki
patent: 4377808 (1983-03-01), Kao
patent: 4442359 (1984-04-01), Lederer

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