Screwdriver, screwdriver bit or the like
AssigneeWera Werk Hermann Werner GmbH & Co.
InventorRolf Gunter Rosenhan
Life of this patent
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Abstract
A screwdriver or screwdriver bit comprising a working end with radially extending engagement surfaces profiled in particular by machining or forming. A surface layer forming a working surface due to nitriting has a hardness of at least 900 HV 0.3 or 67-68 HRC and in an intermediate layer, lying between the hard surface layer and a softer region of a core of the working end, the hardness decreases with a hardness gradient of 1500 to 3000 HV 0.3/mm.
Claims10
A screwdriver comprising a working end with radially extending engagement surfaces profiled in particular by machining or forming, wherein a surface layer forming a working surface due to nitriting has a hardness of at least 900 HV 0.3 or 67-68 HRC and in an intermediate layer, lying between the hard surface layer and a softer region of a core of the working end, the hardness decreases with a hardness gradient of 1500 to 3000 HV 0.3/mm.
A screwdriver bit comprising a working end with radially extending engagement surfaces profiled in particular by machining or forming, wherein a surface layer forming a working surface due to nitriting has a hardness of at least 900 HV 0.3 or 67-68 HRC and in an intermediate layer, lying between the hard surface layer and a softer region of a core of the working end, the hardness decreases with a hardness gradient of 1500 to 3000 HV 0.3/mm.
Dependencies are inferred from the claim text.