US Patent: 1,874,220 - Portable surface cleaning tool


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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
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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.