Communications: electrical – Systems – Call station
Patent
1976-10-29
1978-05-02
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
198502, 331 65, G08B 2100
Patent
active
040878007
ABSTRACT:
A monitoring system for detecting a longitudinal rip in a conveyor belt senses the presence of the rip and simultaneously produces a warning signal and stops the operation of the conveyor system. The system includes a series of sensor circuits embedded in the conveyor belt in spaced relationship along the length of the belt and a series of alarm circuits positioned at intervals along the upper run of the conveyor belt but out of actual contact with the conveyor belt. Each sensor unit embedded in the conveyor belt consists of a loop of conductive wire or ribbon positioned transversely across substantially the width of the conveyor belt and a coil wound on a powder core with its terminals in electrical connection with the ends of the loop of conductive wire or ribbon. When the conveyor belt is free of longitudinal rips, the sensor circuit as it passes in close proximity to the alarm circuit has no noticeable effect on the alarm circuit. However, when a longitudinal rip develops in the conveyor belt and parts the loop of wire in one of the sensor circuits thereby breaking the electrical circuit of that sensor circuit, the effected sensor circuit as it passes in close proximity to an alarm circuit causes the triggering of the alarm circuit that sets off a warning alarm and stops the operation of the conveyor system.
REFERENCES:
patent: 3602884 (1971-08-01), Brumbelow
patent: 3651506 (1972-03-01), Olaf et al.
patent: 3656137 (1972-04-01), Ratz
patent: 3742477 (1973-06-01), Enabnit
Caldwell Sr. John W.
Nowicki Joseph E.
The B. F. Goodrich Company
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