Portable device for testing electrical wiring circuits and power tools and equipment
US4164701A · kind A · utility
Inventors
Key dates
| Filing date | Sep 6, 1977 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | Sep 6, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A portable testing device is disclosed for testing the electrical circuits of power tools and cables having a general three-conductor wiring circuit including a first test station for checking the wiring polarity of an outside electrical receptacle from which the testing device operates and a second test station having a testing circuit and receptacle for receiving a plug of the power equipment being tested for detecting the existence of a defective ground circuit in the power equipment. A third test station is provided for checking the ground continuity of a power tool wiring circuit. A fourth test station is provided for checking the wiring conditions of a three-conductor extension power cable having a three-prong plug carried on one end and a three-socket receptacle carried on the other end. The fourth station includes a testing circuit having a three-prong plug for receiving the receptacle end of the power cable while the plug end of the power cable is inserted into a mating receptacle at the second test station. The test circuit includes indicator means for indicating the wire polarity condition of the power extension cable and for testing the cable for the reversal of the gro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.