Patent ID: 6509823
Filing Date: 2003-01-21
Classification: H02B

Abstract:
An electrical functional unit, comprising:a housing; and a separate, one-piece, plastic cylindrical fixing neck projecting from said housing, said cylindrical fixing neck, including: a longitudinal axis; a circumference; a first free end directed away from said housing; a fine thread disposed around said circumference at said first free end and onto said fine thread a nut can be screwed, said fine thread containing a given core diameter, a nominal diameter, and a fine-thread base having a rounded portion with a radius; a second end directed towards said housing; a radially projecting abutment flange with an annular flank as an abutment surface being normal to said longitudinal axis of said fixing neck and formed in a region above said second end, said cylindrical fixing neck serving for securing the electrical functional unit in a fixing position, in which the electrical functional unit projects through a fastening bore of a wall element and can be braced therein against said radially projecting abutment flange by a screwed-on nut, said cylindrical fixing neck connected to said housing in a region between said radially projecting abutment-flange and said second end; and a thread-free, circumferentially cylindrical shank region formed coaxial with said longitudinal axis and disposed between said fine thread and said radially projecting abutment flange, said thread-free, circumferentially cylindrical shank region having an external diameter substantially equivalent to said given core diameter of said fine-thread, said thread-free, circumferentially cylindrical shank region having an end with a rounded portion merging with said radially projecting abutment flange, said rounded portion formed substantially as a quarter-circle arc in cross section, said rounded portion having a radius corresponding to half a difference between said nominal diameter of said fine thread and said external diameter of said thread-free, circumferentially cylindrical shank region, and said fine thread merging, without any thread runout, into said thread-free, circumferentially cylindrical shank region by way of said radius of said rounded portion of said fine-thread base.