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. 23, 2003
Filed:
Apr. 27, 2001
Steven W. Kegg, North Canton, OH (US);
James R. Nero, Louisville, OH (US);
The Hoover Company, North Canton, OH (US);
Abstract
A motor-fan assembly for a floor care appliance having an improved working air fan for increased performance and noise reduction, a working air fan housing cover having a plurality of spiral shaped grooves, and a motor cooling air fan housing cover with slot shaped vent openings for increased cooling performance. The working air fan has a larger number of blades as compared to conventional fans wherein the blades are of two different lengths arranged in an alternating pattern circumferentially on an annular shaped disc. The blades are spaced closer together to prevent the passage of debris between adjacent blades and also to reduce flow noise. The passage between the edges of the fan blades and the working air fan cover has been widened and made uniform to aid in the passage of debris over the top of the working air fan. The spiral shaped grooves on the working air fan cover breaks the circulation patterns of the working airflow into smaller re-circulation patterns to reduce noise generated in the working air cavity. The slot shaped vent openings in the motor cooling air fan cover are oriented as close as possible to being parallel to the resultant direction of the motor cooling air exiting the motor housing through the vent openings to minimize drag and improve cooling efficiency.