Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1979-06-21
1982-01-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324262, 335205, G01N 2772, G01R 3312, H01H 900
Patent
active
043107974
ABSTRACT:
The stud detector apparatus of the present invention automatically indicates the presence of nails and other ferrous fasteners beneath a wall covering, thus revealing the presence of a wall stud or ceiling joist. The apparatus includes a magnetic actuated switch, a power source, and a light source conductively connected in series. The magnetic actuated switch has a substantially planar wall engaging surface, first and second terminals, and a movable magnet. The movable magnet is normally in a position in which the current path between the terminals is open. When the wall engaging surface is held near a ferrous substance, the movable magnet moves to a position which allows current to flow between the first and second terminals. In use, the wall engaging surface of the apparatus is held near and moved parallel to the surface of the wall. The presence of a nail or other ferrous fastener is indicated when the light source is energized.
REFERENCES:
patent: 2749663 (1956-05-01), Lemelson
patent: 2762970 (1956-09-01), Balduman
patent: 2843821 (1958-07-01), Gottlieb
patent: 3002149 (1961-10-01), Christian
patent: 3487346 (1969-12-01), Gardel et al.
patent: 3665511 (1972-05-01), Wolf
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Advertisement of Mitchell Safety Supply Co. of Phila. Pa., "Locates Any Metal Object Wires, Pipes, Reinforcing Steel Inside Walls & Plaster".
Instruction Sheet of Alarm Device Manufacturing Co. of L.I., N.Y. "How to Install the #56 Recessed Magnetic Contact".
Snow Walter E.
Strecker Gerard R.
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