Communications: electrical – Systems – Call station
Patent
1976-12-15
1977-12-20
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
23255E, G08B 2100
Patent
active
040644987
ABSTRACT:
A pair of sensor assemblies that change in electrical resistance when exposed to a mixture of combustible gas are positioned at a selected location in a mine or on a piece of operating equipment and receive power for continuous operation from a regulated power source. Regulator devices maintain a preselected input signal to the sensor assemblies. When exposed to a mixture of combustible gas, the sensor assemblies generate output signals which are received by a comparator and switch assembly. If an output signal of a sensor assembly exceeds a preselected signal of the comparator associated therewith, an alarm signal is generated and an audible and visual alarm device is actuated to indicate the presence of a combustible mixture of gas in the mine atmosphere. A time delay mechanism is operable to interrupt the input signal to the sensor assemblies if the alarm signal continues longer than a preselected interval. The time delay mechanism also generates a latch signal to continue generation of the alarm signal when the presence of combustible gas has been detected. The regulator device for each sensor assembly transmits an amplified signal proportional to the sensor output signal to a signal deviation detector. If the difference between the amplified signals of the sensor assemblies exceed a preselected value, the signal deviation detector also transmits an output signal to the above alarm device and time delay mechanism.
REFERENCES:
patent: 3147465 (1964-09-01), Brown et al.
patent: 3311455 (1967-03-01), Robinson
patent: 3399398 (1968-08-01), Becker et al.
patent: 3482233 (1969-12-01), Ogg
patent: 3496558 (1970-02-01), Willson et al.
patent: 3519391 (1970-07-01), Winter et al.
patent: 3678489 (1972-07-01), Scherban et al.
patent: 3717858 (1973-02-01), Hadden
patent: 3815114 (1974-06-01), Johnson et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 3887335 (1975-06-01), Boutonnat
Burr John F.
Hadi Homayoun
Adams John M.
Caldwell Sr. John W.
Consolidation Coal Company
Mikesell, Jr. William A.
Myer Daniel
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