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:
Sep. 19, 1989
Filed:
Jul. 07, 1987
Hitoshi Kawano, Ise, JP;
Mitsuhiro Hayashi, Ise, JP;
Yukio Yamamoto, Ise, JP;
Kunikatsu Ban, Ise, JP;
Shinko Electric Co., Ltd., Tokyo, JP;
N.P.W. Technical Laboratory Co., Mie, JP;
Abstract
A seam welder with wire electrodes inserted between upper and lower roller electrodes to weld an overlap section of a cylinderical body formed of metal plate between the electrodes. The power supply for the welder includes a rectifying circuit for obtaining a dc voltage from an ac current source, a smoothing circuit for smoothing the dc voltage, a single converting circuit to convert the smoothed dc voltage into an alternating polarity pulse voltage, a transformer for applying this pulse voltage to the upper and lower electrodes and a capacitor connected between the primary side of the transformer and the output side of the converting circuit with a capacitance that produces resonance with the inductance of the transformer primary at the pulse voltage frequency.