Wera Werk Hermann Werner Gmbh & Co.

Giuseppe De Bona

Andreas Reusch

The invention relates to a screwdriver or screwdriver attachment (S) comprising one input and one output end ( and ) and a shank ( ) located in between the two. The output end has at least three, preferably four, ribs ( ) which radiate outwards from a central section ( ) located around the axis of rotation (x&mdash;x). The ribs ( ) on each end side have a face, which is placed at an angle to the axis of rotation, and flanks on the front and back side ( ) which run substantially parallel to each other in the area next to the frontal face ( ). In this area the flank ( ) on the front side is located on a diametrical surface (diameter D&mdash;D) in relation to the axis of rotation (x&mdash;x), whereby the flanks ( ) of adjoining ribs ( ) form a groove ( ) which runs lengthways and whose root ( ) ends in the outer surface of a section of the shank. The invention provides a solution that is more balanced in terms of load and easier to use, by having flanks ( ) that are curved in such a way that they point away from each other in the direction of the axis, starting from the face area of each rib ( ).

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Remscheid, Germany

Giuseppe De Bona