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. 25, 1990
Filed:
Mar. 09, 1989
Kazuhiro Yasumoto, Nakatsugawa, JP;
Ippei Hagiwara, Nakatsugawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In an axial-flow fan, a motor support, a frame having a cylindrical inner surface, a boss fixed to the drive shaft and having a cylindrical outer surface, and blades radially extending from the cylindrical outer surface of the boss is provided legs for connecting the frame and motor support, and are also provided with surfaces inclined with respect to the direction of the air stream to reduce resistance to air flow. In another embodiment, the downstream end of the air duct defined by the cylindrical inner surface of the frame is gradually expanded toward the direction in which air is blown out. In a further embodiment, the upstream end of the boss has cut-away portions for enlarging the area of the cross section for air flow.