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US Patent: 1,874,220
Portable surface cleaning tool
Patentee:
Frank E. Aurand (exact or similar names) - Chicago, IL

USPTO Classifications:
15/179, 15/93.1, 29/81.05, 29/81.17

Tool Categories:
handheld power tools

Assignees:
None

Manufacturer:
Aurand Mfg. & Equipment Co. - Cincinnati, OH
Concrete Surfacing Machinery Co. - Cincinnati, OH

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 28, 1930
Granted: Aug. 30, 1932

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Aurand Mfg. & Equipment Co.
Vintage Machinery entry for Concrete Surfacing Machinery Co.
Description:
Improvements to patent 1,648,888. In the original design, the steel of the cutter elements was found to crystallize due to the repeated impact loads. This improved design introduces a yielding wire mounting which absorbs some of the shock impacts.

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