Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-07-19
1988-03-22
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, 340552, G08B 1800, G08B 2200
Patent
active
RE0326275
ABSTRACT:
A continuous loop transmitting winding assembly is disposed in one panel and a vertically oriented figure eight receiving coil winding assembly is disposed in a second panel, the two panels being mounted on pivots for swinging gate type movement straddling the pathway to be controlled by a magnetic surveillance system. This arrangement confines the surveillance field to the pathway and tends to follow the passage of an object bearing a marker therealong. No marker detecting backfield is generated. Alternatively, one winding assembly is moveable while the other is stationary thereby similarly confining the field.
Special winding configurations are used to reduce interference from third harmonic signals produced in adjacent metallic counters. The arrangement also imposes immunity to signals emanating from cash registers, motors and the like.
Door and single gate mounted magnetic and microwave surveillance systems are also disclosed.
REFERENCES:
patent: 3697972 (1972-10-01), Brown
patent: 3868669 (1975-02-01), Minasy
patent: 3895368 (1975-07-01), Gordon et al.
patent: 4139844 (1979-02-01), Reeder
patent: 4212002 (1980-07-01), Williamson
patent: 4251808 (1981-02-01), Lichtblau
patent: 4260990 (1981-04-01), Lichtblau
patent: 4309697 (1982-01-01), Weaver
"Access Control System . . . hands-free", N.V. Nederlandsche, Holland.
Eskandry Ezra D.
Gentzler David L.
Humble David R.
Lamanna Peter J.
Weaver Jon N.
Sensormatic Electronics Corporation
Swann III Glen R.
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