Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Reexamination Certificate
1999-12-03
2001-11-27
Brown, Glenn W. (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
C324S543000, C324S556000, C324S156000
Reexamination Certificate
active
06323657
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a conductor tester, and more particularly to a conductor tester having light-emitting diodes for conveniently indicating present conditions of tested conductors.
An electrician would usually check conductors in a newly completed wiring system for general electric equipment or computer systems through direct trial runs of the equipment or computer systems, so that correct connection of the conductors and/or normal data transmission over the wiring system can be ensured. In the case any disorder in data transmission over the wiring system is found, the electrician would use an instrument to test two ends of each conductor in the wiring system for correct make thereof.
However, there is not any effective way or instrument currently available for detecting any problems, such as open circuit, reverse connection and incorrect connection, possibly existing among conductors, particularly for detecting of normal data transmission over conductors between two ends of the wiring system. The only way to find out transmission problems among conductors in a wiring system is, therefore, to check the conductors one by one or even have the whole wiring system repaired. It is, of course, extremely time and labor consuming and inefficient to do so. Thus, it is desirable to have an improved conductor tester developed to solve the problems existing in the checking of conductors among a wiring system.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a conductor tester that is suited for testing either one single conductor or a number of conductors included in a wiring system.
Another object of the present invention is to provide a conductor tester that is provided with means to conveniently indicate directly on the tester any test result.
A further object of the present invention is to provide a conductor tester that includes two separable working units that can be connected to each other to form a compact unit and automatically switch off when the conductor tester is not in use.
To achieve the above and other objects, the conductor tester of the present invention mainly includes two contour-identical parts of a main unit and a remote unit. Both the main and the remote units are formed at two ends with high and low raised portions that are provided with fastening means for the two units to detachably connect to each other to form a compact unit. The high and low raised portions are provided at side walls with notches that are electrically connected to internal circuits of the main and the remote units, and at inner walls between the high and low raised portions with light-emitting diodes. By connecting the main and/or the remote unit at two notches thereof of two ends of one or more conductors, internal circuits of the main and/or the remote unit are brought to electrically contact with the conductor or conductors, causing one or more of the light-emitting diodes to light to indicate present conditions of the conductor or conductors, such as short circuit, open circuit, reverse connection, wrong connection, etc.
Moreover, the main unit and the remote are internally provided with magnetic reed switches and magnetic elements, such that when the main and the remote units are closely connected to each other to form a compact body, the magnetic reed switches in the two units magnetically attract to bring the main and the remote units in an off state, and when the main and the remote units are separated from each other, the magnetic reed switches are caused to make and thereby automatically switch on the main unit and the remote unit.
REFERENCES:
patent: 4959792 (1990-09-01), Sullivan
patent: 5448162 (1995-09-01), Beha
patent: 5477152 (1995-12-01), Hayhurst
Brown Glenn W.
Dintek Electric Limited
Rosenberg , Klein & Lee
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