Thermally responsive switch
US5221914A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1992 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Sep 24, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H37/5427
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A thermally responsive switch for protecting electric motors against overcurrent and overheating conditions includes a metallic receptacle having an elongated dome-shaped portion and an opening opposite to the dome-shaped portion, a metallic header plate secured to the one end of the receptacle so as to hermetically close the opening afterwards and having a through-aperture, a thermally responsive element disposed in the receptacle in parallel with the header plate and carrying a movable contact at one end, a rod terminal secured in the aperture of the header plate by an electrically insulating material filled in the aperture for hermetic sealing so that the terminal extends through the aperture, a fixed contact support disposed in the receptacle to be perpendicular to the terminal and having an end to which a fixed contact is secured, the support being connected at the other end to the end of the terminal projected into the receptacle, by solder, and a spring for urging the support so that it is disconnected from the terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.