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:
Apr. 25, 2000
Filed:
Aug. 26, 1997
Jurgen Dorschky, Saint Mery, FR;
Christian Millet, Rouvres, FR;
Control Devices, Inc., Standish, ME (US);
Abstract
A protective device suitable for being placed in the power supply circuit of an electric motor, having at least one anti-interference coil (20, 30) for the motor, and a thermal switch (10) thermally coupled to coil (20, 30) and capable of opening the power supply circuit when the coil temperature which it detects reaches a predetermined value, representative of the maximum temperature threshold allowed within the motor. Advantageously, the device also has an electric heating element, thermally coupled to the switch and capable of constituting a main current path between the two input terminals of a four-terminal network consisting of the protective device, when the power supply circuit is open, and capable of holding this circuit open in order to limit the opening-closing cycles of the switch, the invention also pertains to the corresponding process and to a drive device containing a motor and of said protective device mounted on the motor, outside of it.