Screw-in element having changing thread profile and method for its production
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United States of America Patent
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Oct 21, 2014
Grant Date -
Jan 31, 2008
app pub date -
Nov 9, 2005
filing date -
Nov 9, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a screw-in element having a changing thread profile, in particular an artificial hip joint socket which may be screwed in, and a method for producing screw-in elements of this type. For the purpose of implementing a specific curve of the thread tooth height along the thread extension, it is suggested that the flank of the thread tooth pointing in the screw-in direction be implemented having a constant angle, and the other flank of the thread tooth be implemented having a changing angle. In addition, it is suggested that a type of staircase function made of ramps and steps be superimposed on the thread course to implement a clearance angle and an exposed position of the thread tooth in this way. The practical implementation of the method requires a CNC machine, preferably a CNC lathe, having a so-called B axis and a specific procedure in regard to the programming. The thread design according to the present invention results, in particular with a self-cutting design, in a reduction of the force required when screwing into tough material.
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