Screw anchor with conical head for rail attachment
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United States of America Patent
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May 7, 2013
Grant Date -
Oct 27, 2011
app pub date -
Dec 10, 2009
filing date -
Dec 10, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A screw anchor for concrete attachment to a railroad tie or solid track comprises external threads (16) disposed on the exterior of the screw anchor (10) and internal threads (18) disposed inside the screw anchor (10) for force-fitted connecting to a fastening element (30), wherein the screw anchor (10) comprises two sections (12, 14) adjacent to one another in the longitudinal direction, the first section (12) having a substantially cylindrical external shape and the second section (14) having a substantially conical external shape, and wherein the second section (14) is disposed between the first section (12) and an inlet opening (26) for the fastening element (30).
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