Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1976-01-02
1977-12-06
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
29421M, 72DIG30, 336223, B21D 2602
Patent
active
040610071
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 coil 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: 963907 (1910-07-01), Larzelere
patent: 1994767 (1935-03-01), Heintz
patent: 3195335 (1965-07-01), Brower et al.
patent: 3703958 (1972-11-01), Kolm
patent: 3704506 (1972-12-01), Orr et al.
patent: 3745448 (1973-07-01), Hiratsuka
patent: 3771086 (1973-11-01), Poulsen
patent: 3810373 (1974-05-01), Quegrolx
Hansen Karl A.
Hendrickson I. Glen
Gilden Leon
The Boeing Company
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