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. 21, 2018
Filed:
Aug. 22, 2012
Tatsuya Ishigaki, Kanagawa, JP;
Takuya Uehara, Kanagawa, JP;
Yoshio Hamamoto, Kanagawa, JP;
Osamu Yamaguchi, Kanagawa, JP;
Takeshi Maehara, Kanagawa, JP;
Hiromi Kato, Kanagawa, JP;
Tatsuya Ishigaki, Kanagawa, JP;
Takuya Uehara, Kanagawa, JP;
Yoshio Hamamoto, Kanagawa, JP;
Osamu Yamaguchi, Kanagawa, JP;
Takeshi Maehara, Kanagawa, JP;
Hiromi Kato, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An underwater welding apparatus includes: an underwater welding head provided underwater and having, at its leading end, a nozzle section from which laser light is emitted; a shied cover formed of an elastic member and provided around the nozzle section so as to form, at the leading end of the underwater welding head, a space where water is excluded by shield gas; and an expansion/contraction member having a discharge hole for discharging water and shield gas containing metal dust particles from an inside of the shield cover, the discharge hole being increased in diameter as pressure inside the shield cover rises, while being reduced in diameter as the pressure inside the shield cover falls.