Stairwell security system
First Claim
1. A stairwell security system comprising:
- a door monitoring sensor for detecting movement through a stairwell door;
a first stairway monitoring sensor for detecting occupancy in the stairwell proximate the door;
a second stairway monitoring sensor for detecting occupancy in the stairwell proximate the next higher door;
a third stairway monitoring sensor for detecting occupancy in the stairwell proximate the next lower door;
timing means for measuring a first time period in response to activation of said door sensor and for measuring a second time period in response to activation of said first stairway sensor during said first time period; and
alarm means for indicating a suspicious occupancy at the expiration of said second time period in the absence of detection of occupancy by one of said second and third stairway monitoring sensors.
4 Assignments
0 Petitions
Accused Products
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.
28 Citations
26 Claims
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1. A stairwell security system comprising:
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a door monitoring sensor for detecting movement through a stairwell door; a first stairway monitoring sensor for detecting occupancy in the stairwell proximate the door; a second stairway monitoring sensor for detecting occupancy in the stairwell proximate the next higher door; a third stairway monitoring sensor for detecting occupancy in the stairwell proximate the next lower door; timing means for measuring a first time period in response to activation of said door sensor and for measuring a second time period in response to activation of said first stairway sensor during said first time period; and alarm means for indicating a suspicious occupancy at the expiration of said second time period in the absence of detection of occupancy by one of said second and third stairway monitoring sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A security system comprising:
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an entry monitoring sensor for detecting movement into a first space; a first area monitoring sensor for detecting occupancy in said first space; at least one adjacent area monitoring sensor for detecting occupancy in at least one space adjacent said first space; timing means for measuring a first time period in response to actuation of said entry sensor and for measuring a second time period in response to actuation of said first area sensor during said first time period; and alarm means for indicating a suspicious occupancy at the expiration of said second time period in the absence of detection of occupancy by said adjacent area sensor for detecting occupancy in at least one space adjacent said first space. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification