US Patent: 1,874,220
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Portable surface cleaning tool
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Patentee:
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Frank E. Aurand (exact or similar names) - Chicago, IL |
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Patent Dates:
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Applied: |
Mar. 28, 1930 |
Granted: |
Aug. 30, 1932 |
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Jeff Joslin Vintage Machinery entry for Aurand Mfg. & Equipment Co. Vintage Machinery entry for Concrete Surfacing Machinery Co.
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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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