Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With electrothermal-actuating means
Patent
1975-06-25
1977-01-18
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With electrothermal-actuating means
335208, 335284, H01H 6100, H01F 1300
Patent
active
040042596
ABSTRACT:
A thermomagnetic switch is mountable on a chamber wall to extend into a liquid filled chamber. A reed switch in the switch is controlled by the strength of a magnetic field produced by a cylindrical magnet surrounding the reed switch. The magnetic flux passing through the reed switch is varied by a ferromagnetic cylindrical element having a magnetic permeability varying with temperature that shunts magnetic flux at a level varying with temperature. A ferrous slug or shaft adjacent to the reed switch is movable to shunt a selectable portion of the magnetic flux and permit a fine temperature adjustment. A method of adjusting the operating temperature of switch reduces the magnetic strength of the magnet in the switch in small increments while the switch is exposed to a selected temperature until the switch operates to establish its operating temperature.
REFERENCES:
patent: 2144546 (1939-01-01), Reese et al.
patent: 3303398 (1967-02-01), Barta et al.
patent: 3428867 (1969-02-01), Becker
patent: 3760310 (1973-09-01), Carson
Harris George
Rathbun Harold J.
Schmeling William H.
Square D Company
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