Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-03-12
1977-08-09
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 725, G01R 3102, G01R 106
Patent
active
040413802
ABSTRACT:
A multi-function tester includes a hollow elongate cylindrical case having a longitudinal axis. A probe needle is fixedly mounted along the axis at one end of the case. A retractable protective sheath is provided which selectively covers and exposes the tip of the probe needle. A transparent cartridge containing electrical circuitry for performing a predetermined number of electrical tests is removably receivable within the case, with a penlite type battery being interposed between the cartridge and the probe needle. A compression spring is interposed between the battery conductive outer case and the probe needle. Electrical contacts connected to the circuitry within the cartridge are in electrical engagement with both the battery conductive outer case as well as to the center or positive terminal of the battery. An indexing arrangement is provided which is connected to another probe and is arranged to successively engage adjacent ones of a predetermined number of electrical contacts provided at the end of the cartridge proximate to the indexing arrangement. The cartridge is interchangeably receivable within the case to facilitate repair of the tester as well as to increase its versatility by permitting different tests or series of tests to be performed by different cartridges insertable into the same tester unit to thereby electrically connect different electrical elements to the tester probes. Lamps within the cartridge light up and provide a visual indication of test results through the transparent cartridge and a slot in the tester case.
REFERENCES:
patent: 1696266 (1928-12-01), Coote
patent: 1707051 (1929-03-01), Colosoff
patent: 1888906 (1932-11-01), Colosoff
patent: 2413521 (1946-12-01), Roskilly
patent: 2540402 (1951-02-01), Mosier
patent: 2547248 (1951-04-01), Bartholomew
patent: 3196217 (1965-07-01), Petrina
patent: 3315163 (1967-04-01), Lutz
patent: 3704411 (1972-11-01), Jamieson
patent: 3783371 (1974-01-01), McMillan
Kastar, Inc.
Strecker Gerard R.
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