Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1975-08-05
1977-05-24
Miller, J. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 77, H02H 314
Patent
active
040258220
ABSTRACT:
A two to three wire converter circuit is disclosed which provides a protective function for users when using power hand tools, appliances or any electrically operated device. Many alternating current electrical supplies provide a hot or high line and a neutral line. Many electrical devices, such as hand tools and appliances, are provided with a high line, neutral and a ground line connected to the housing of the device. The present invention enables the connection of the housing ground line or the housing to the neutral line. The neutral line of an alternating current supply is connected to ground. The present invention provides a circuit for sensing which line is the high line and which line is the neutral line of an electric supply and connecting these to the electrical device only if the neutral line of the supply is connected to the neutral line of the electrical device. This invention serves an essential function since a two-prong plug may be inserted into the conventional electrical supply outlet two ways, the correct way with the normally high sides being connected, or incorrectly with the high side of supply being connected to the neutral line of the electrical device.
The purpose of the above abstract is to provide a non-legal technical statement of the disclosure of the contents of the instant patent application and thus serve as a searching-scanning tool for scientists, engineers and researchers. Accordingly, this abstract is not intended to be used in understanding or otherwise comprehending the principles of the present invention hereinafter described in detail, nor is it intended to be used in interpreting or in any way limiting the scope or fair meaning of the claims appended hereto.
REFERENCES:
patent: 2870380 (1959-01-01), Rocha
patent: 2999189 (1961-09-01), Gerrard
patent: 3313960 (1967-04-01), Borys
patent: 3588603 (1971-06-01), Siugantz
patent: 3766434 (1973-10-01), Sherman
patent: 3961319 (1976-06-01), Asberry
Barrett, Jr. Stewart P.
Hughes W. Taliaferro
Miller J. D.
Salce Patrick R.
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