Safety-protection circuit

Details Safety-protection circuit Safety-protection circuit

2005-03-15

2005-03-15

Pham, Toan N. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S691100, C340S641000, C340S642000, C361S001000

Reexamination Certificate

active

06867703

ABSTRACT:
In the process of drilling a concrete in a building, many times contact and damage can accidentally be made with existing electrical conduit and the wires inside, or plumbing pipes. This damage can be avoided with a device which can indicate a grounded metal, such as a conduit, plumbing pipes, supporting frames or metal beam, all of which may be grounded to the existing electrical system. A safety protection circuit is incorporated into a power tool and includes at least one LED indicator connected to a low voltage power supply and to the body of the power tool to be illuminated when contact with grounded metal occurs.

REFERENCES:
patent: 4089031 (1978-05-01), Stevens
patent: 4626834 (1986-12-01), Caruthers
patent: 4722021 (1988-01-01), Hornung et al.
patent: 5357179 (1994-10-01), Abbagnaro et al.
patent: 6236177 (2001-05-01), Zick et al.

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