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:
Aug. 11, 1987
Filed:
Apr. 07, 1986
Hirokazu Nomura, Mie, JP;
Yukihiko Sato, Mie, JP;
Yasuhiko Nishi, Mie, JP;
Mizuho Higurashi, Tokyo, JP;
Saburo Mori, Yokohama, JP;
Nippon Kokan Kabushiki Kaisha, Tokyo, JP;
Nippon Kokan Koji Kabushiki Kaisha, Yokohama, JP;
Abstract
A gas shield chamber for enclosing a welding joint of a pair of rails during the arc welding of the welding joint. A pair of side backing plates are each held in contact with the groove at one side of the rails within the chamber and the side backing plates are respectively movable independently of each other by a pair of drives having manual-powered operation change-over means. The ratio of respective flow rates of each shielding gas from respective injectors into the chamber is varied in accordance with the movement of the side backing plates. A pair of ground terminals of a welding power source are arranged on the sides of the rails.