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. 20, 2002
Filed:
Jan. 12, 2001
Peter K. Bostwick, Maryland Heights, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A fan has a plurality of blades that are each configured to induce radial-flow adjacent the trailing edge of the blade while also being configured to induce both radial-flow and axial-flow near the base end of the blade. This is achieved by splitting each of the blades into two sections and orienting the chord-line of the blades near the hub of the fan at angle relative to the axis of the hub while maintaining the chord-line of the blades parallel to the axis near the trailing edges of the blades. This results in an increased ability of the fan to draw air in axially as compared to conventional radial-flow fans. The fan of the preferred embodiment also makes use of an annular ring joining the trailing edges of the blades. The ring has axially opposite sides that taper toward one another as the ring extends radially inward and acts as a diverter to channel air to axially opposite sides of an annular obstruction in the flow path of air being exhausted from the fan, thereby further increasing the fan's efficiency.