Safety device for socket which is connected to electrical power supply
US5760499A · kind A · utility
1Cited by
0References
2Claims
0Family size
Inventor
Key dates
| Filing date | Jul 3, 1995 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Jul 3, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H11/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A safety device includes a comparator circuit includes three resistors arranged in series. An IC has a positive pole coupled to the resistors and has a negative coupled to the positive pole of another IC which has a negative pole coupled to the resistors. A signal output circuit includes a transistor having a base connected to the ICs and having a collector coupled to a relay. The relay includes two common contacts for selectively contacting with two normally closed contacts and two normally open contacts so as to supply electric power to the common contacts when an electric appliance is coupled between the common contacts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.