Communications: electrical – Selective – Having indication or alarm
Patent
1984-02-17
1986-03-11
Crosland, Donnie L.
Communications: electrical
Selective
Having indication or alarm
340641, 340643, 340 57, 337332, 337298, 337 5, 335 31, 335 43, 307 10AT, B60R 2500, G08B 2100
Patent
active
045757062
ABSTRACT:
A combined magnetic and thermal activated relay for use in alarm systems. The relay includes a thermal activated bimetal switch in series with the current through the magnetic coil which activates a magnetic switch. The thermal switch is in a normally closed state and the magnetic switch is in a normally open state. When current passes through the coil the magnetic switch changes from its normally open to a closed state applying voltage potential for an external requirement. The heat generated by the coil's resistance to current flow heats the core of the magnetic coil, and after reaching an elevated temperature level the thermal activated switch changes from its normally closed state to an open state opening the current flow path through the magnetic coil causing the magnetic switch to return to its normal open state removing voltage for the external requirement. The switching operation of the thermal switch cycles with temperature changes. The time between cycles can be selected by coil varying the size of the core, size of the coil wire, the number of turns of the coil wire or the type of metal used in the bimetal rotor.
REFERENCES:
patent: 3508237 (1970-04-01), Kimmelman
patent: 3925757 (1975-12-01), Kimmelman
patent: 4480249 (1984-10-01), Heidman, Jr.
Crosland Donnie L.
Gilliam Frank D.
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