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:
Feb. 02, 1999
Filed:
May. 04, 1998
Soichi Kato, Konan, JP;
Takashi Sugita, Konan, JP;
Zexel Corporation, Tokyo, JP;
Abstract
In a flat tube formed by machining a brazing sheet, ridges 12a-12c are formed at each of the opposing flat portions 11a and 11b of the flat tube 4 along the lengthwise direction of the flat tubes so that the ridges contact the inner surfaces of each of the opposite flat portions. The width of the grooves of the ridges 12a-12c formed at the surfaces of the flat portions is set so that it is at the smallest end portions of the flat tubes 4 to achieve flatness at the end portions of the flat tubes 4. The end portions of the fins 5 are bonded at these flattened portions 15 (areas A) formed at the end portions of the flat tubes 4. Header pipes and the flat tubes are thus brazed in a reliable manner while achieving reinforcement of the end portions of the flat tubes to be inserted into insertion holes formed in the header pipes. Through a structure in which ridges are formed at the end portions of the flat tubes and, at the same time, flatness is assured at the end portions, a good yield of the brazing material is realized at the contact areas of the header pipes and the flat tubes.