The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 1991
Filed:
May. 23, 1989
I Glen Hendrickson, Seattle, WA (US);
Karl A Hansen, Seattle, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
An electromagnetic dent remover having a tapped work coil (36) is provided. A first current pulse, I.sub.S, is applied to an inner and outer coil (48 and 46) to produce an electromagnetic field that exerts a repelling force on a conductive part (24). A second current pulse, I.sub.F, having a polarity opposite that of the I.sub.S current pulse and a rise time shorter than that of the I.sub.S pulse, is applied to the inner coil (48), which collapses the electromagnetic field associated with the inner coil (48) and causes a pulling force to be exerted on the part (24) by the inner coil (48). The work coil (36) is positioned over a dent in the conductive part (24) so that the pulling force produced by the inner coil (48) is concentrated on the dent and pulls the dent from the part (24). Simultaneously, the pulling force is counteracted by the repelling force produced with the outer coil (46). The repelling force stabilizes the part ( 24) to facilitate the removal of the dent. In addition to stabilizing the part (24), the repelling force created by the outer coil (46) may be used to remove convex deformations (20) of the dent.