US Patent 7171997 Portable electric router having radial fan

Patent 7171997 was granted and assigned to Hitachi on February, 2007 by the United States Patent and Trademark Office.

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Patent Inventor Names

Akira Onose0

Shinki Ohtsu0

Tomomasa Nishikawa0

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Patent abstract

A compact and light-weight portable electric router produced at a low cost and capable of providing high cutting efficiency with low noise. A radial fan includes a cylindrical hub functioning as an attachment portion to a motor shaft, a plurality of fan blades having parts connecting to the hub, and a ring like guide section connected to the hub through the fan blades. An annular weight is connected to the guide section at a radially outer side of the guide section. The weight serves as a restriction section for restricting backflow of air from a discharge side to a motor side.

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Official Website

https://pdfpiw.uspto.gov/.piw?Docid=071719970

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