Thermal protective switch
US4135177A · kind A · utility
Inventors
Key dates
| Filing date | May 2, 1977 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | May 2, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H37/764
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A thermally sensitive switch is provided with two parallel lead wires or conductive members which are confined within a two section insulated housing. Electrical continuity between members is established by a conductive contact element which bridges the two conductive members to provide a continuous electrical path. The contact element is held in place by a temperature sensitive material which changes state at a predetermined temperature and by a spring element which exerts a force on the pellet through the contact element. When the temperature sensitive material changes state, the spring force drives the contact between the conductive members to effect a snap-action instantaneous interruption of the electrical circuit. The construction and assembly of the components provide for minimizing the production cost of the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.