US Patent: 2,170,036
|
| Small electric machine tool
|
|
Patentee:
|
|
| Robert Schumann (exact or similar names) - Dusseldorf, Germany |
|
|
Patent Dates:
|
| Applied: |
Mar. 19, 1937 |
| Granted: |
Aug. 22, 1939 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Jeff Joslin
Vintage Machinery entry for Precise Products Corp.
|
|
Description: |
| The inventor was the son of instrument maker Adolph Schumann, whose "Firma A. Schumann", founded 1882, manufactured optical equipment and scientific instruments. Robert Schumann's invention was a handheld rotary tool which is now known as a "Dremel tool". But Albert J. Dremel came later; first was Schumann's invention which was manufactured by A. Schumann and sold in Europe as the "Diros". As late as the 1980s Diros tools were being imported into North America. A 1932 issue of "American Progress" (Vol. 13-14 p. 127) mentions "The 'Diros' drill, built by A. Schumann, drills holes up to 3 mm (0.12 in.) in brass and up to 2 mm (0.08 in.) in steel..." By the time this patent was issued, the inventor and his family had fled Nazi Germany for the US, where they would settle in Racine, Wisconsin. He established Precision Products Co. and began manufacturing handheld rotary tools, which were adopted by the US military.We have also seen "Precise" brand handheld/toolpost grinders made in Düsseldorf, West Germany, by Precise Gmbh Fabrik für Elektrowerkzeuge ("Power Tool Factory"), and bearing this patent number plus 2,031,133, 2,368,888, 2,377,271, and 2,452,268. |
|
