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US 5,706,903 AGranted
Tool
AssigneeRobert Bosch GmbH
InventorsAlfred Odendahl, Karl Wanner
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsAlfred Odendahl, Karl Wanner
Estimating the term…
A device on machine tools for transmitting a rotational and/or percussive movement to a tool (22) has two or three rotational drivers (14) which are arranged so as to be symmetrical with respect to rotation. The rotational drivers (14) are stepped and flank parts (16) extending radially to the center axis (15) alternate with guide portions (17) extending along a cylindrical outer surface. Locking members (20) which engage in depressions (28) at the tool (22) are arranged in the region of the rotational drivers (14) for the axial locking of the tools (10). With the tool holder (10) according to the invention, tool shafts having diameters between 8 and 12 mm can be clamped without converting or modifying the tool shafts. Good true running characteristics can be achieved in spite of the stationary rotational drivers (14).
A tool for at least one of a drill chuck and a tool holder having a plurality of inwardly projecting rotational drivers with flanks extending approximately radially and connected by guide portions, for a hand-held drill or hammer device, the tool comprising a shaft provided with a plurality of grooves which are arranged to receive the drivers and located at angular intervals at a circumference of said shaft, said grooves having at least on one side a plurality of substantially planar lateral walls which are arranged approximately radially to a tool axis in a stepped manner and are connected with one another by connecting portions.
Dependencies are inferred from the claim text.