Electrical safety device

Details Electrical safety device Electrical safety device

1990-09-06

1991-05-07

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 50, 340650, H02H 316

Patent

active

050141546

ABSTRACT:
An electrical safety device for use in power tools that is designed to automatically discontinue operation of the power tool upon physical contact of the tool with a concealed conductive material. A step down transformer is used to supply the operating power for a disconnect relay and a reset relay. When physical contact is made between the power tool and the conductive material, an electrical circuit through the disconnect relay is completed and the operation of the power tool is automatically interrupted. Once the contact between the tool and conductive material is broken, the power tool can be quickly and easily reactivated by a reset push button activating the reset relay. A remote reset is provided for convenience and efficiency of operation.

REFERENCES:
patent: 2747154 (1956-05-01), Abrams
patent: 3171062 (1965-02-01), Rowe, Jr.
patent: 3242382 (1966-03-01), Rogers, Sr.
patent: 3450947 (1969-06-01), Rogers, Sr.
patent: 4028594 (1977-06-01), Schossow
patent: 4089031 (1978-03-01), Stevens
patent: 4224652 (1980-09-01), Fiorentzis
patent: 4722121 (1988-01-01), Hornung et al.

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