US Patent: 2,377,271 - Flexible Shaft And Air-Cooled Hand Piece


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US Patent: 2,377,271

Flexible Shaft And Air-Cooled Hand Piece

Patentee:

Robert Schümann (exact or similar names) - Racine, Racine County, WI

USPTO Classifications:

29/DIG.67, 29/DIG.83, 409/135, 409/175, 451/358, 451/449, 464/17, 74/551.9, 82/900

Tool Categories:

handheld power tools : handheld power tool accessories

handheld power tools : handheld grinders

Assignees:

Anne R. Schümann - Racine, Racine County, WI

Manufacturer:

Precise Fabrik für Elektrowerkzeuge - Dusseldorf, North Rhine-Westphalia, Germany

Precise Products Co. - Racine, Racine County, WI

Witnesses:

Unknown

Patent Dates:
Applied:	Dec. 12, 1942
Granted:	May 29, 1945

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Precise" Toolpost Grinder
"Vintage Machinery" entry for Precise Products Corp.

Description:

Claim:

At the present time flexible shafts are used as a unit in fixed attachment to stationary motors. These flexible shafts, which are used for rotating various types of implements such as grinders, drills, buffers, sanders and the like, have band pieces which, due to the high speed at which the flexible shaft core rotates, become very hot, thus necessitating frequent interruption of the work being done to permit the hand piece to cool. Some hand pieces are provided with. insulation covering but such covering does not fully protect the operator's hands against the heat developed.