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:
Dec. 03, 1985
Filed:
Feb. 19, 1985
Hirotsugu Oishibashi, Musashino, JP;
Katsuyoshi Ueyama, Musashino, JP;
Muneyuki Ohara, Musashino, JP;
Mitsuo Nakamura, Higashikurume, JP;
Takeo Aichi, Kitakyushu, JP;
Shigeru Sasaki, Niiza, JP;
Japanese National Railways, Tokyo, JP;
Hakusan Seisakusho Co., Ltd., Tokyo, JP;
Kyushu Tetsudo Kiki Seizo Co., Ltd., Fukuoka, JP;
Abstract
A method of field welding head-hardened rails which includes the steps of gas pressure welding the rails, shearing off excess metal therefrom at the welded portion with a portable welder device, subjecting the railhead of the pressure welded portion of the rails to a subsequent heat treatment with a gas heater device, setting a width of the pressure welded portion to be heated at the time of the subsequent heat treatment with a pair of jigs, and cooling the portion which has undergone the subsequent heat treatment with an air blowing type cooler.