Alert condition system usable for personnel monitoring

• US 5,268,670 A
• Filed: 10/04/1991
• Issued: 12/07/1993
• Est. Priority Date: 10/04/1991
• Status: Expired due to Term

• Current Assignee: Stanley Works Limited (Stanley Black & Decker, Inc.)
• Original Assignee: Sensory Technologies LLC (DSI Video Systems LLC)
• Inventors: Cross, Alan W., Brasch, John J.
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): MULLEN, THOMAS J
• Application Number:
  US07/771,618
• Time in Patent Office: 795 Days
• Field of Search: 340/541, 340/545, 340/567, 340/666, 340/572-573, 340/539, 340/522, 340/523, 340/527-528, 340/691, 340/331, 358/105, 358/108, 187/105, 187/131-132, 187/140
• US Class Current: 340/541
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Abstract

To generate an alert signal indicating that an unauthorized subject is in a first region within seven feet of a passageway, a radio transmitter is worn by the subject and received by a receiver at the passageway. A second signal is generated upon satisfaction of a second condition, such as an open door at the passageway, which second signal indicates the likelihood of the subject passing through the passageway. A first display indicates if the first signal is present and a second signal if the second condition occurs.

Claims

1. A method of generating an alert signal comprising the steps of:

generating a first signal when an unauthorized subject is in a first region within seven feet of a monitored passageway;

generating a second signal upon satisfaction of a second condition that indicates the likelihood of the subject passing through the passageway;

displaying a first indication if the first signal is present and a second indication if the second condition occurs;

the step of generating a first signal including the step of transmitting a signal from the subject to a receiver.

2. A method in accordance with claim 1 in which the step of generating the second signal includes the step of generating a second signal whenever a door to the passageway is open.

3. A method in accordance with claim 1 in which the step of generating the second signal includes the step of generating a second signal whenever an infrared detector senses a person at the passageway.

4. A method in accordance with claim 1 in which the step of generating second signal includes the step of generating the second signal whenever a person is sensed by a pressure pad in a first locality in front of the passageway.

5. A method in accordance with claim 1 in which the step of generating a first signal includes the step of transmitting a signal from a location adjacent to the passageway.

6. A security system comprising:

first means for generating a first signal when an unauthorized subject is within seven feet of a passageway;

second means for generating a second signal upon satisfaction of a second condition that indicates the likelihood of the subject passing through the passageway; and

third means for displaying a first indication if the first signal is generated and for displaying a second indication upon the generation of the second signal;

said first means for generating a first signal including means for transmitting a signal from the subject to a receiver.

7. A security system in accordance with claim 6 in which the second means for generating a second signal includes means for generating a second signal whenever a door to the passageway is open.

8. A security system in accordance with claim 6 in which the second means comprises means for generating a second signal whenever an infrared detector senses a person at the passageway.