The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1983
Filed:
May. 29, 1981
Tohoku Metal Industries, Ltd., Miyagi, JP;
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.