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US Patent: 2,031,133
Electric Hand Tool
Patentee:
Robert Schümann (exact or similar names) - Dusseldorf, North Rhine-Westphalia, Germany

USPTO Classifications:
192/111.6, 192/70.251, 81/476, 81/57.31

Tool Categories:
handheld power tools : handheld grinders

Assignees:
None

Manufacturer:
Precise Fabrik für Elektrowerkzeuge - Dusseldorf, North Rhine-Westphalia, Germany
Precise Products Co. - Racine, Racine County, WI

Witnesses:
Unknown

Patent Dates:
Applied: Jan. 24, 1933
Granted: Feb. 18, 1936

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:
Application filed in Germany, 25 Jan., 1932

Claim:

The object of the invention is to produce a tool of the above mentioned kind in which the pressure exerted by the operator for pressing the tool against the workpiece cannot exceed the turning movement necessary for the individual sizes of screws, so that, whilst ensuring against overturning of the screw, there is a control that the screw is sufficiently strongly tightened and it is possible to adjust the turning movement for the individual sizes of screws. In the known tools of the aforementioned type the turning movement exerted on the portion of the tool engaging the workpiece is merely determined by the pressure-exerted on the tool which can lead to the overturning of the screw to be tightened or to an insufficiently strong tightening of the screw.

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