Metal working – Method of mechanical manufacture – Electrical device making
Patent
1977-09-14
1978-12-05
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
72705, 336206, 336223, 336225, H01F 4106
Patent
active
041279336
ABSTRACT:
An electromagnetic dent remover including a dent removal head containing an electromagnetic work coil capable of creating a locally concentrated magnetic field when first energized by a slow rising current followed by a fast pulsing counter current is disclosed. The electromagnetic work coil comprises a cylinder formed of a spirally wound metal strip whose convolutions are electrically insulated from one another by coatings or layers of electrical insulation. In one form, slots and holes, located in the walls of the coil, control the electrical current density within the coil to thereby produce the desired locally concentrated magnetic field. In another form, the ends of the coils are machined such that at least one magnetic field concentration projection projects outwardly from one annular end of the coil. The other end of the coil is machined such that it is a mirror image of the projection end. In either form the electromagnetic work coil is encased in a nonmagnetic housing, which may be formed by encapsulation.
REFERENCES:
patent: 3665597 (1972-05-01), Tan et al.
patent: 3737990 (1973-06-01), Schut
Hansen Karl A.
Hendrickson I. Glen
Hall Carl E.
The Boeing Company
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