Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Thermomagnetic
Patent
1981-05-29
1983-06-21
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
Thermomagnetic
335207, H01H 3600
Patent
active
043896286
ABSTRACT:
A thermo-magnetically operated switch having lower and higher operating points is maintained open below the lower operating point and above the higher operating point and is maintained closed between the two different operating points, and comprises a reed switch, two permanent magnets disposed alongside the reed switch over the respective reeds, a first ferromagnetic body having a Curie point corresponding to the higher operating point and disposed between the two magnets, and a second ferromagnetic body or bodies having a Curie point corresponding to the lower operating point and disposed along the two magnets. In order to improve reliability of the switch, two third ferromagnetic bodies having Curie points at or above the lower operating point are disposed to engage axial opposite ends of the second ferromagnetic body or bodies and the other pole faces of the magnets opposite the pole faces engage the first ferromagnetic body. The third ferromagnetic bodies may be integrally formed with the second ferromagnetic body or bodies.
REFERENCES:
patent: 3895328 (1975-07-01), Kato et al.
Baba Tetsuro
Sato Hiroyasu
Sato Yoshiharu
Broome Harold
Tohoku Metal Industries Ltd.
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