Tester for three wire grounding electrical outlet
US3952244A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1974 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Oct 3, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/67
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A polarity identifier and fault tester for testing three wire grounding type receptacles quickly and in a foolproof manner. A plurality of condition indicators are provided which are activated in a multiplicity of different patterns each representing a different specific condition. Each condition indicator is a go no-go type thereby eliminating the need for interpretation by the operator other than to compare any abnormal pattern with a chart to identify the particular fault condition in the outlet connections. The tester has but a single control comprising a push button switch that requires no connection to ground or other object other than the insertion of the three prong tester plug into the outlet to be checked. A total of 27 possible conditions can be checked and identified as proper or improper by observing the indicator pattern before and upon closing the single control button.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.