Metal working – Method of mechanical manufacture – Electrical device making
Patent
1987-08-18
1989-04-11
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29605, 26427219, 264 465, H01F 706
Patent
active
048193216
ABSTRACT:
A coil assembly for a metal detector and a method for making coil assemblies for metal detectors of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame have an aperture therethrough for the passage of material undergoing inspection, applying a coating of carbon material to the exterior of the frame, applying a layer of plastic material over the carbon material, winding electrically conductive strands over the plastic material, fixing the frame to a rigid metal housing providing an enclosed void around the exterior of the coated frame and strands, and applying foam plastic in liquid form to the frame and strands until the void is filled with the foam plastic.
REFERENCES:
patent: 2237254 (1941-04-01), Broekhuysen
patent: 3361962 (1968-01-01), Albrecht
patent: 3368175 (1968-02-01), Giegerich et al.
Barkley & Dexter Laboratories, Inc.
Echols P. W.
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