Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-09-06
1979-08-14
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 73R, G01R 3102
Patent
active
041647017
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 ground and neutral conductors therein.
REFERENCES:
patent: 2806993 (1957-09-01), Matousek
patent: 2840781 (1958-06-01), Ragonese
patent: 2858507 (1958-10-01), Liautaud et al.
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patent: 3648163 (1972-03-01), Pinner et al.
patent: 3728617 (1973-04-01), Potter
patent: 3753088 (1973-08-01), Ettelman
patent: 3800214 (1974-03-01), O'Flynn
patent: 3967195 (1976-06-01), Averitt et al.
Austin Lloyd M.
Gulledge Charles P.
Stephens James B.
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